body {
	margin:0; padding:0; height:100%; 
}
div.horizon {
	
	position: absolute;	top: 50%;	left: 0px;	width: 100%;	height: 1px;	overflow: visible;	
}
div.player {
	width:800px; border:1px dotted black; top:-300px; position:absolute; left:50%; margin-left:-400px
}