html,
body {
	font-family: Meiryo,"Hiragino Kaku Gothic Pro";
	height: 100%;
	margin: 0;
	padding: 0;
	position: relative;
	background-color: #b3b3b3;
}
h1 {
	position: fixed;
	text-align: center;
	width: 800px;
	height: 800px;
	inset: 0;
	margin: 0 auto;
	padding: 0;
	z-index: 100;
	font-size: 32px;
	font-weight: normal;
}
canvas {
	position: fixed;
	width: 100%;
	height: 100%;
	margin: 0;
	padding: 0;
}