#global {
	position:absolute;
	left:50%;
	
	width: 792px;
	height: 420px;
	
	margin-left: -396px; /* moitié de la largeur */
	z-index: 40;
    
     }
#backg {
	position: absolute;
	height: 1050px;
	width: 2000px;
	margin:auto;
	z-index: 1;
	left: 0px;
	top: 0px;
}
#intro {
	position: absolute;
	height: 900px;
	width: 792px;
	z-index: 40;
}