#back{position:relative;}#notreMonde{	position:absolute;  z-index: 9998;  min-height: 100%;  min-width: 1024px;  width: 100%;  height: auto;  position: fixed;  top: 0;  left: 0;  background:#000;  margin:0 auto;  text-align:center;  filter : alpha(opacity=90);  opacity : 0.9;}#pub{	position: absolute;	z-index:99999;	top: 45px;	left:50%;	margin-left:-512px;	width:1024px;	height:600px;	background:#000;	border-radius:9px;}#btn{	position:absolute;	right:0px;	top:-35px;	color:#000;	background:#cfcfcf;	border-radius:4px;	height:22px;	padding: 5px;	text-decoration:none;}#btn:hover{background:#fff;}