body {margin:0px; padding:0px; color:#002431; background-color:#002431}
.caja1 { height:50%; background-color:#002431}
.caja2 { background-image:url(../images/line_horizontal.gif); height:424px}
.caja3 { height:50%; background-color:#011827}

.centrado {text-align:center}
img {border:none}