body {
	background: black;
	color: white;
	font-family: arial;
}

table {
    margin-left: auto;
    margin-right: auto;
    width: 30em;
	border-width: 1px;
	border-style: solid;
	border-color: gray;
}

h1 {
	text-align: center;
}

.error {
	color: red;
	text-align: center;
}

img {
    margin-left: auto;
    margin-right: auto;
    display: block;
}

img.nocenter {
	display: inline;
}

.block {
	text-align: center;
}