.background { 
	position: fixed;
	top: 0;
	left: 0;
	margin: 0;
	padding: 0;
	width: 100%;
	height: 100%;
	z-index: -999;
	background: no-repeat center center fixed;
	-webkit-background-size: cover;
	-moz-background-size: cover;
	-o-background-size: cover;
	background-size: cover;
}