html, body {
  margin: 50;
  padding: 0;
  color: black;
  background-color: #f9a31a;
}

body {
	font-size: 76%;
	text-align: center;
	margin: 5px;
	font-family: Verdana,Helvetica,Arial,sans-serif;
}

div.video {
	width: 320px;
	height: 280px;
	margin: 0 auto;
	
}


div.center {
	width: 640px;
	margin: 0 auto;
}

div.navigation {
	clear: both;
}

a.vor {
	display: block;
	width: 100px;
	float: right;
}

a.zurueck {
	display: block;
	width: 150px;
	float: left;
	
}