body {
	text-align: center;
	width: 90%;
	max-width: 900px;
	margin: 0 auto;
}
a {
	color: #666;
}
ul {
	text-align: left;
}
header {
	margin-top: 100px;
	margin-bottom: 100px;
}
footer {
	margin-top: 100px;
}