De Wikisource, la biblioteca libre.
.doble {
border-top: 1px solid black;border-bottom: 1px solid black;background:white;
}
.tabla-portada {
margin-left:auto;
margin-right:auto;
text-align:center;
width:28em;
}
h2 {
font-size:2em;
font-family:normal;
font-weight:bold;
}