html, body {
	touch-action:none;
	content-zooming:none;
	position:absolute;
	margin:0;
	padding:0;
	left:0;
	top:0;
	width:100%;
	height:100%;
	background:#000;
}

#canvas {
	position: absolute;
	left: 50%;
	top: 50%;
	width:600px;
	height:300px;
	margin-left: -300px;
	margin-top:-150px;
}