body {
margin: 0;
padding: 0;
text-align: center;
}

#box {
position: relative;
margin-left: auto;
margin-right: auto;
margin-top: 3em;
padding: 0;
text-align: left;
width: 40em;
background-color: eeeeee;
}

#content {
padding:3em;
}

#tlc, #trc, #blc, #brc {
background-repeat: no-repeat;
}

#tlc {
background-image:url(imagenes/tlc.gif);
background-position: 0% 0%;
}

#trc {
background-image:url(imagenes/trc.gif);
background-position: 100% 0%;
}

#blc {
background-image:url(imagenes/blc.gif);
background-position: 0% 100%;
}

#brc {
background-image:url(imagenes/brc.gif);
background-position: 100% 100%;
}

#tb, #bb {
background-repeat: repeat-x;
}

#tb {
background-image:url(imagenes/tb.gif);
background-position: 0% 0%;
}

#bb {
background-image:url(imagenes/bb.gif);
background-position: 50% 100%;
}

#rb {
background-image:url(imagenes/r.gif);
background-position: 100% 0%;
background-repeat: repeat-y;
}

#lb {
background-image:url(imagenes/l.gif);
background-position: 0% 100%;
background-repeat: repeat-y;
}

#hueco{
background-image:url(imagenes/blanco.gif);
}