*{
	margin:0;
	padding:0;
}

#vorne{
	position: absolute;
	left:0px;
	top:0px;
	width:528px;
	height:528px;
	background:#000;
}
#hinten{
	position: absolute;
	left:0px;
	top:528px;
	width:528px;
	height:528px;
	background:#000;
}