style.css

*{
    margin:0;
    padding:0;
    font-family: 'Poppins',sans-serif;
    box-sizing: border-box;
}
body{
    background: #001e4d;
}
.app{
    background: #fff;
    width:90%;
    max-width:600px;
    margin: 100px auto 0;
    border-radius: 10px;
    padding:30px;

}
.app h1{
    font-size: 25px;
    color:#001e4d;
    font-weight: 600;
    border-bottom: 1px solid #333;
    padding-bottom: 30px;
}
.quiz{
    padding: 20px 0;
}
.quiz h2{
    font-size:18px;
    color:#001e4d;
    font-weight: 600;

}
.btn{
    background:#fff;
    color:#222;
    font-weight: 500;
    width:100%;
    border:1px solid #222;
    padding:10px;
    margin:10px 0;
    text-align: left;
    border-radius: 4px;
    cursor:pointer;
    transition:all 0.2s;

}
.btn:hover:not([disabled]){
    background: #222;
    color:#fff;

}
.btn:disabled{
    cursor:no-drop;
}
#next-btn{
    background: #001e4d;
    color:#fff;
    font-weight:500;
    width:150px;
    border:0;
    padding:10px;
    margin:20px auto 0;
    border-radius:4px;
    cursor: pointer;
    display: none;
}
.correct{
    background:#9aeabc;
}
.incorrect{
    background:#ff9393;
}