html {
	background-color: gray;
	font-family: "Liberation serif", serif;
	font-size: 1.2em;
}

body {
	background-color: white;
	height: 100%;
	width: 80%;
	margin-left: auto;
	margin-right: auto;
	padding: 1em;
}

header {
	text-align: center;
}

article > article {
	width: 80%;
	margin-left:auto;
	margin-right:auto;
}