html, body {
  margin: 0;
  padding: 0;
  background: black;
  color: white;
  margin: 2em;
}
a:link, a:visited, input[type=submit] {
	background: dimgray;
	color: white;
	width: 20em;
	margin: 0.1em;
	text-decoration: none;
	text-align: center;
	border: 0em;
	padding: 1.5em;
	display: block;
	float: left;
}
a:hover, input[type=submit]:hover {
	color: lightgray;
}
h1, h2, p, .row {
	clear: both;
}