#liste_video_1 {
	position: absolute;
	width : 800px;
	height: 355px;
	left: 50px;
	top: 80px;
        z-index: 9;
	border: 0px dotted white; 
	}		  
	
#liste_video_2 {
	position: absolute;
	width : 800px;
	height: 355px;
	left: 50px;
	top: 80px;
        z-index: 10;
	border: 0px dotted white; 
	}		  
	
#liste_video_3 {
	position: absolute;
	width : 800px;
	height: 355px;
	left: 50px;
	top: 80px;
        z-index: 11;
	border: 0px dotted white; 
	}