.kortbox {

	
	width: 2000px;
	height: 2000px;
    background-image: url('http://www.dvdfix.dk/shop/mere/images/dvdfixkort.jpg');
	border: 1px solid blue;
}             

	.kunskaerm {
	
			visibility:hidden;
			position:absolute;
	top:0px;
	left:0px;

}