body {
	margin: 20px;
	padding: 0;
	background: white;
	font-family: Helvetica,Arial,sans-serif;
}

#content {
        position: absolute;
	width: 640px;
	height: 640px;
	top: 50%;
	left: 50%;
	margin-top: -320px;
	margin-left: -320px;

}