.simple {
margin-top:2em;
margin-bottom:10em;
}
.doble {
border-top: 1px solid black;
border-bottom: 1px solid black;
background:white;
margin-top:2em;
margin-bottom:4em;
}
h2 {
font-family:serif;
}
h3 {
font-family:serif;
}
h4 {
font-family:serif;
}