/* body */
body {
	padding-left: 50%;
}

/* main container */
#container {
	position: absolute;
	width: 940px;
	height: 500px;
	/* Center the left-top corner in the center of the page  */
	top: 50%;
	left: 50%;
	/* set top- and left-margins to half of the height and width */
	margin-top: -250px;
	margin-left: -470px;
}