table.nav {
	clear: both;
	table-layout: fixed;
	max-width: 30em;
	margin: 1em auto;
	border: none;
}

table.nav td {
	max-width: 6em;
	width: 6em;
	text-align: center;
	background-color: #eee;
	border: 1px solid #999;
}