#hintergrundebene {
	position:absolute; 
	z-index:1; 
	left: 0; 
	top: 0; 
	width:100%; 
	height:100%; 
	border: 0px;
	opacity: 0;
	 -webkit-background-size: cover;
 	 -moz-background-size: cover;
	 -o-background-size: cover;
  	  background-size: cover;
}