html, body {
	background-color:#e3e3e3;
	margin:0;
	padding:0;
	text-align:center;
	height: 100%;
}

#centeredcontent {
	width: 800px;
	height: 600px;
	text-align: center;
	border: 0px solid #000;
	background-color: #e3e3e3;
	color: #f0f0f0;
	position: absolute;
	left: 50%;
	top: 50%;
	margin-left: -400px; 
	/* Half the width of the DIV tag which is 50 pixels */
	margin-top: -300px; 
	/* Half the height of the DIV tag which is also 50 pixels */
}