style.css

/* Style sheet */
*{
    font-family: sans-serif;
}

.contador{
    text-align: center;
    font-size: 2rem;
    background-color: #eee;
}

h1{
    margin: 10px;
}

.contenedorPreguntas{
    padding: 15px;
    text-align: center;
}

label{
    text-align: center;
}

input{
    display: block;
    margin: 0 auto 35px;
    padding: 5px;
    font-size: 1rem;
    width: 95%;
    max-width: 500px;
    background-color: transparent;
    border: none;
    border-bottom:2px #000 solid;
}

button{
    font-size: 1.2rem;
    font-weight: bold;
    padding: 15px;
    margin: 0 20px 20px;
    width: 90%;
    max-width: 280px;
    border: none;
    border-radius: 10px;
}

#reiniciar{
    background-color: rgba(245, 76, 76, 0.792);
}

#listo{
    background-color: rgb(65, 205, 65);
}