body {
	background-color: #555;
	font-family: sans-serif;
	overflow: hidden;

	display: flex;
	justify-content: center;
	align-items: center;

	--wContent: 100vw;
	--hContent: 100vh;
	margin: 0;
	padding: 0;
	height: 100vh;
}

#ow
{ 
	padding: 0;
	display: inline-block;
}

#cw
{
	display : inline-block;
}

#cw canvas
{
	max-width: 100vw;
	max-height: 100vh;
}