html, body {
	height: 100%;
	margin: auto;
	padding:0;
	
}

#main {
	width: 504px;
	height: 344px;
	text-align: center;
	position: absolute;
	left: 50%;
	top: 50%;
	margin-left: -252px; 
	margin-top: -172px; 
}