html {
				height: 100%;
				width: 100%;
				margin: 0;
				padding: 0;
				background: grey url(chao-wallpaper.png);
				background-size: 10vw;
			}
			body { margin: 0; padding: 0; }
			main {
				max-width: 35rem;
				padding: 1rem;
				margin: 0rem auto;
				background: white;
			}
			h1, h2 {
				text-align: center;
			}
			ul {
				display: inline-block;
				margin: 0 auto;
			}