* {
	margin: 0;
	padding: 0;
}

html, body {
	height: 100%;
	width: 100%;
	background: #ddd;
}

#board {
	display: block;
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	margin: auto;
	width: 500px;
	height: 500px;
	background-color: black;
	-webkit-border-radius: 4px;
	-moz-border-radius: 4px;
	border-radius: 4px;
}