body {
	margin-left: auto;
	margin-right: auto;
	max-width: 960px;
	background-color: silver;
        padding: 4px;
}
div {
	background-color: white;
}
div#content {
	padding: 1em;
	border: 1px solid black;
}

div#error {
	color: red;
	text-align: center;
}

p       { margin-top: 0; margin-bottom: 0; vertical-align: top }
pre     { margin-top: 0; margin-bottom: 0; vertical-align: top }
table   { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1      { text-align: center }