body {
	background: #E7E7E7;
	background-image: url(/images/sfondo_prehome.jpg);
	background-position: top center;
	background-repeat: repeat-y;
}
#container_prehome {
  width: 920px;
  height: 510px;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -460px;
  margin-top: -255px;
  border: 0px solid #FF0000;
}