body{
margin:0;
font-family: Arial, Helvetica, sans-serif;
background:#f5f7fb;
color:#222;
}

.header{
background:#1e2a44;
color:white;
padding:20px;
text-align:center;
}

.header nav a{
color:white;
margin:0 10px;
text-decoration:none;
font-weight:bold;
}

.hero{
background:#2e3f66;
color:white;
padding:60px 20px;
text-align:center;
}

.contenido{
padding:40px 20px;
max-width:900px;
margin:auto;
}

.footer{
background:#1e2a44;
color:white;
text-align:center;
padding:20px;
}
/* BOTÓN REGRESAR */
.boton-regresar{
    text-align:center;
    margin-top:15px;
}

.boton-regresar a{
    background-color:#1f3c88;
    color:white;
    padding:12px 22px;
    text-decoration:none;
    border-radius:8px;
    font-weight:bold;
    display:inline-block;
    transition:0.25s;
}

.boton-regresar a:hover{
    background-color:#162a5c;
    transform:scale(1.05);