style.css

body {
	margin: 0;
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
	background: #222;
	color: white;
	font-family: Arial, sans-serif;
}

canvas {
	width: 800px;
	height: 600px;
	border: 1px solid #fff;
}