html, body {
	width: 100%;
	height: 100%;
	margin: 0px;
}

canvas {
	position:absolute;
	left:0px;
	top:0px;
}

div {
	position:absolute;
	right:10px;
	top:0px;
	width:300px;
	height:100%;
	z-index:0;
	background-color:yellow;
}

#background {
	z-index:-1;
}

#menu {
	z-index:1;
}