html, body {	
	margin: 0px;
	padding: 0px; 
	width: 100%;
	height: 100%;
}


#zentriert-index {
  	position: absolute;
  	top: 50%;
  	left: 50%;
	width: 500px;
  	height: 510px;
  	margin-left: -250px;
  	margin-top: -255px;
}

#zentriert {
  	position: absolute;
  	top: 50%;
  	left: 50%;
	width: 800px;
  	height: 500px;
  	margin-left: -400px;
  	margin-top: -250px;
}

#textinhaltfuerblinde {
  	visibility: hidden;
}