From c074d7059ce7d40feee3540680b30a23a05387ff Mon Sep 17 00:00:00 2001
From: Jason Brownlee <jason.brownlee05@gmail.com>
Date: Fri, 20 Dec 2024 09:14:13 +1100
Subject: [PATCH] center content

---
 docs/nature-inspired/acknowledgments.html          |  4 ++--
 docs/nature-inspired/advanced.html                 |  4 ++--
 docs/nature-inspired/advanced/new_algorithms.html  |  4 ++--
 docs/nature-inspired/advanced/paradigms.html       |  4 ++--
 docs/nature-inspired/advanced/problem_solving.html |  4 ++--
 .../advanced/racing_algorithms.html                |  4 ++--
 .../advanced/testing_algorithms.html               |  4 ++--
 .../advanced/visualizing_algorithms.html           |  4 ++--
 docs/nature-inspired/appendix1.html                |  4 ++--
 docs/nature-inspired/clever.css                    | 14 ++++++++++++++
 docs/nature-inspired/copyright.html                |  2 +-
 docs/nature-inspired/errata.html                   |  4 ++--
 docs/nature-inspired/evolution.html                |  4 ++--
 .../evolution/differential_evolution.html          |  4 ++--
 .../evolution/evolution_strategies.html            |  4 ++--
 .../evolution/evolutionary_programming.html        |  4 ++--
 .../evolution/gene_expression_programming.html     |  4 ++--
 .../evolution/genetic_algorithm.html               |  4 ++--
 .../evolution/genetic_programming.html             |  4 ++--
 .../evolution/grammatical_evolution.html           |  4 ++--
 .../evolution/learning_classifier_system.html      |  4 ++--
 docs/nature-inspired/evolution/nsga.html           |  4 ++--
 docs/nature-inspired/evolution/spea.html           |  4 ++--
 docs/nature-inspired/foreword.html                 |  4 ++--
 docs/nature-inspired/immune.html                   |  4 ++--
 docs/nature-inspired/immune/airs.html              |  4 ++--
 .../immune/clonal_selection_algorithm.html         |  4 ++--
 docs/nature-inspired/immune/dca.html               |  4 ++--
 .../immune/immune_network_algorithm.html           |  4 ++--
 .../immune/negative_selection_algorithm.html       |  4 ++--
 docs/nature-inspired/index.html                    |  2 +-
 docs/nature-inspired/introduction.html             |  4 ++--
 docs/nature-inspired/neural.html                   |  4 ++--
 docs/nature-inspired/neural/backpropagation.html   |  4 ++--
 docs/nature-inspired/neural/hopfield_network.html  |  4 ++--
 docs/nature-inspired/neural/lvq.html               |  4 ++--
 docs/nature-inspired/neural/perceptron.html        |  4 ++--
 docs/nature-inspired/neural/som.html               |  4 ++--
 docs/nature-inspired/physical.html                 |  4 ++--
 .../physical/cultural_algorithm.html               |  4 ++--
 .../physical/extremal_optimization.html            |  4 ++--
 docs/nature-inspired/physical/harmony_search.html  |  4 ++--
 .../physical/memetic_algorithm.html                |  4 ++--
 .../physical/simulated_annealing.html              |  4 ++--
 docs/nature-inspired/preface.html                  |  4 ++--
 docs/nature-inspired/probabilistic.html            |  4 ++--
 docs/nature-inspired/probabilistic/boa.html        |  4 ++--
 .../probabilistic/compact_genetic_algorithm.html   |  4 ++--
 .../probabilistic/cross_entropy.html               |  4 ++--
 docs/nature-inspired/probabilistic/pbil.html       |  4 ++--
 docs/nature-inspired/probabilistic/umda.html       |  4 ++--
 docs/nature-inspired/stochastic.html               |  4 ++--
 .../stochastic/adaptive_random_search.html         |  4 ++--
 docs/nature-inspired/stochastic/grasp.html         |  4 ++--
 .../stochastic/guided_local_search.html            |  4 ++--
 .../stochastic/hill_climbing_search.html           |  4 ++--
 .../stochastic/iterated_local_search.html          |  4 ++--
 docs/nature-inspired/stochastic/random_search.html |  4 ++--
 .../stochastic/reactive_tabu_search.html           |  4 ++--
 .../nature-inspired/stochastic/scatter_search.html |  4 ++--
 docs/nature-inspired/stochastic/tabu_search.html   |  4 ++--
 .../stochastic/variable_neighborhood_search.html   |  4 ++--
 docs/nature-inspired/swarm.html                    |  4 ++--
 docs/nature-inspired/swarm/ant_colony_system.html  |  4 ++--
 docs/nature-inspired/swarm/ant_system.html         |  4 ++--
 docs/nature-inspired/swarm/bees_algorithm.html     |  4 ++--
 docs/nature-inspired/swarm/bfoa.html               |  4 ++--
 docs/nature-inspired/swarm/pso.html                |  4 ++--
 web/generate.rb                                    |  4 ++--
 69 files changed, 148 insertions(+), 134 deletions(-)

diff --git a/docs/nature-inspired/acknowledgments.html b/docs/nature-inspired/acknowledgments.html
index ea1c9769..1f585519 100644
--- a/docs/nature-inspired/acknowledgments.html
+++ b/docs/nature-inspired/acknowledgments.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -75,5 +75,5 @@ <h1><a name='acknowledgments'>Acknowledgments</a></h1>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced.html b/docs/nature-inspired/advanced.html
index dff1167c..c58ffcb7 100644
--- a/docs/nature-inspired/advanced.html
+++ b/docs/nature-inspired/advanced.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -60,5 +60,5 @@ <h3>Advanced Topics</h3>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced/new_algorithms.html b/docs/nature-inspired/advanced/new_algorithms.html
index 3ce09b48..51c5eff4 100644
--- a/docs/nature-inspired/advanced/new_algorithms.html
+++ b/docs/nature-inspired/advanced/new_algorithms.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -377,5 +377,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced/paradigms.html b/docs/nature-inspired/advanced/paradigms.html
index 5a2571c7..d0ce4d2a 100644
--- a/docs/nature-inspired/advanced/paradigms.html
+++ b/docs/nature-inspired/advanced/paradigms.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -454,5 +454,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced/problem_solving.html b/docs/nature-inspired/advanced/problem_solving.html
index aa29f79f..0bb9ded9 100644
--- a/docs/nature-inspired/advanced/problem_solving.html
+++ b/docs/nature-inspired/advanced/problem_solving.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -469,5 +469,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced/racing_algorithms.html b/docs/nature-inspired/advanced/racing_algorithms.html
index d0491d2c..691b9196 100644
--- a/docs/nature-inspired/advanced/racing_algorithms.html
+++ b/docs/nature-inspired/advanced/racing_algorithms.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -321,5 +321,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced/testing_algorithms.html b/docs/nature-inspired/advanced/testing_algorithms.html
index 362e6cce..b411d07d 100644
--- a/docs/nature-inspired/advanced/testing_algorithms.html
+++ b/docs/nature-inspired/advanced/testing_algorithms.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -237,5 +237,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/advanced/visualizing_algorithms.html b/docs/nature-inspired/advanced/visualizing_algorithms.html
index 6e153e1a..1ae67620 100644
--- a/docs/nature-inspired/advanced/visualizing_algorithms.html
+++ b/docs/nature-inspired/advanced/visualizing_algorithms.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -370,5 +370,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/appendix1.html b/docs/nature-inspired/appendix1.html
index 1e6ae03f..6b8bb1b4 100644
--- a/docs/nature-inspired/appendix1.html
+++ b/docs/nature-inspired/appendix1.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -372,5 +372,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/clever.css b/docs/nature-inspired/clever.css
index 17e024e4..6da7cb28 100644
--- a/docs/nature-inspired/clever.css
+++ b/docs/nature-inspired/clever.css
@@ -1,4 +1,18 @@
 
+body {
+    margin: 0; /* Remove default margin */
+    padding: 0; /* Remove default padding */
+}
+
+.container {
+    width: 880px; /* Set the width of your content */
+    max-width: 100%; /* Ensures responsiveness for smaller screens */
+    margin: 0 auto; /* Center the container horizontally */
+    padding: 20px; /* Optional: Add some padding if needed */
+    box-sizing: border-box; /* Ensure padding doesn't affect width */
+}
+
+
 /* centre and bold captions for code listings */
 .caption {
 	text-align: center;
diff --git a/docs/nature-inspired/copyright.html b/docs/nature-inspired/copyright.html
index ceb449cc..61a8c6f7 100644
--- a/docs/nature-inspired/copyright.html
+++ b/docs/nature-inspired/copyright.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
diff --git a/docs/nature-inspired/errata.html b/docs/nature-inspired/errata.html
index bffa3b5a..92c710b1 100644
--- a/docs/nature-inspired/errata.html
+++ b/docs/nature-inspired/errata.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -75,5 +75,5 @@ <h2><a name='revision_1'>Revision 1</a></h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/evolution.html b/docs/nature-inspired/evolution.html
index 22214197..7e20c4ea 100644
--- a/docs/nature-inspired/evolution.html
+++ b/docs/nature-inspired/evolution.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -237,5 +237,5 @@ <h3>Bibliography</h3>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/evolution/differential_evolution.html b/docs/nature-inspired/evolution/differential_evolution.html
index da39e6ce..22e6f345 100644
--- a/docs/nature-inspired/evolution/differential_evolution.html
+++ b/docs/nature-inspired/evolution/differential_evolution.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -277,5 +277,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
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diff --git a/docs/nature-inspired/evolution/evolution_strategies.html b/docs/nature-inspired/evolution/evolution_strategies.html
index 99bc31c5..56b5077e 100644
--- a/docs/nature-inspired/evolution/evolution_strategies.html
+++ b/docs/nature-inspired/evolution/evolution_strategies.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -275,5 +275,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
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diff --git a/docs/nature-inspired/evolution/evolutionary_programming.html b/docs/nature-inspired/evolution/evolutionary_programming.html
index d147b044..e9d1582c 100644
--- a/docs/nature-inspired/evolution/evolutionary_programming.html
+++ b/docs/nature-inspired/evolution/evolutionary_programming.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -285,5 +285,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/evolution/gene_expression_programming.html b/docs/nature-inspired/evolution/gene_expression_programming.html
index c6949db0..2a8f7fc2 100644
--- a/docs/nature-inspired/evolution/gene_expression_programming.html
+++ b/docs/nature-inspired/evolution/gene_expression_programming.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -311,5 +311,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
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diff --git a/docs/nature-inspired/evolution/genetic_algorithm.html b/docs/nature-inspired/evolution/genetic_algorithm.html
index 89a4b7fa..bb9fa827 100644
--- a/docs/nature-inspired/evolution/genetic_algorithm.html
+++ b/docs/nature-inspired/evolution/genetic_algorithm.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -309,5 +309,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/evolution/genetic_programming.html b/docs/nature-inspired/evolution/genetic_programming.html
index 12bd98e1..844acdfa 100644
--- a/docs/nature-inspired/evolution/genetic_programming.html
+++ b/docs/nature-inspired/evolution/genetic_programming.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -397,5 +397,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
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diff --git a/docs/nature-inspired/evolution/grammatical_evolution.html b/docs/nature-inspired/evolution/grammatical_evolution.html
index 92f7f4de..9f0a6744 100644
--- a/docs/nature-inspired/evolution/grammatical_evolution.html
+++ b/docs/nature-inspired/evolution/grammatical_evolution.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
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           <em>A book by Jason Brownlee</em>
@@ -281,5 +281,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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index 18c2ab3b..aa88e710 100644
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -252,5 +252,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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diff --git a/docs/nature-inspired/preface.html b/docs/nature-inspired/preface.html
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -69,5 +69,5 @@ <h2><a name='about_the_book'>About the book</a></h2>
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diff --git a/docs/nature-inspired/probabilistic.html b/docs/nature-inspired/probabilistic.html
index 8f4f32c7..7a108c4a 100644
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -150,5 +150,5 @@ <h3>Bibliography</h3>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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index b7b98c87..d2decabc 100644
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -360,5 +360,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -208,5 +208,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -239,5 +239,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -223,5 +223,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -209,5 +209,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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diff --git a/docs/nature-inspired/stochastic.html b/docs/nature-inspired/stochastic.html
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -62,5 +62,5 @@ <h3>Algorithms</h3>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -248,5 +248,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -290,5 +290,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -298,5 +298,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -194,5 +194,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -269,5 +269,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -188,5 +188,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -403,5 +403,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -317,5 +317,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -278,5 +278,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -253,5 +253,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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diff --git a/docs/nature-inspired/swarm.html b/docs/nature-inspired/swarm.html
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -152,5 +152,5 @@ <h3>Bibliography</h3>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -311,5 +311,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
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           </head>
         <!-- call to display ruby source nicely -->
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           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -297,5 +297,5 @@ <h2>Bibliography</h2>
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     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
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diff --git a/docs/nature-inspired/swarm/bees_algorithm.html b/docs/nature-inspired/swarm/bees_algorithm.html
index 45cf7452..8c41db4c 100644
--- a/docs/nature-inspired/swarm/bees_algorithm.html
+++ b/docs/nature-inspired/swarm/bees_algorithm.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -253,5 +253,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/swarm/bfoa.html b/docs/nature-inspired/swarm/bfoa.html
index 798ffa32..0b7f671a 100644
--- a/docs/nature-inspired/swarm/bfoa.html
+++ b/docs/nature-inspired/swarm/bfoa.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -328,5 +328,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/docs/nature-inspired/swarm/pso.html b/docs/nature-inspired/swarm/pso.html
index 7da84a85..b6f6a652 100644
--- a/docs/nature-inspired/swarm/pso.html
+++ b/docs/nature-inspired/swarm/pso.html
@@ -6,7 +6,7 @@
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()"><!-- Start Header -->
+        <body onload="prettyPrint()"><div class="container"><!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
           <em>A book by Jason Brownlee</em>
@@ -281,5 +281,5 @@ <h2>Bibliography</h2>
 <!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>
\ No newline at end of file
diff --git a/web/generate.rb b/web/generate.rb
index 373ab216..c6c9f3ee 100644
--- a/web/generate.rb
+++ b/web/generate.rb
@@ -26,7 +26,7 @@ def header(title)
             <script type="text/javascript" src="https://cleveralgorithms.com/nature-inspired/prettify.js"></script>
           </head>
         <!-- call to display ruby source nicely -->
-        <body onload="prettyPrint()">'
+        <body onload="prettyPrint()"><div class="container">'
   str << '<!-- Start Header -->
           <center>
           <h1>Clever Algorithms: Nature-Inspired Programming Recipes</h1>
@@ -1184,7 +1184,7 @@ def footer()
   return '<!-- generate math images from latex math snippets -->
     <script type="text/javascript" src="https://mathcache.s3.amazonaws.com/replacemath.js"></script>
     <script type="text/javascript">replaceMath(document.body);</script>
-        </body>
+        </div></body>
           </html>'
 end