html {
	height: 100%;
	
} 
body {
	margin-top: 0px;
	height: 100%;
	width:100%;
	margin-left: 0px;
	margin-bottom: 0px;
	background-color: #000000;
}
.box{
	position:absolute;
	top:50%;
	left:50%;
	margin:-220px 0 0 -380px;
}