body {
	font-family: Arial, Helvetica, sans-serif;
	font-size: 12px;
	background-color: #FFF;
	margin: 0px;
}

#center_container {
	width: 1000px;
	position: absolute; 
 	left: 50%;
 	margin-left: -500px;
	margin-top: 30px;
	height: 800px;
	background-image: url(baustelle.jpg);
	background-repeat: no-repeat;
}