html, body {
	width: 100%;
	height: 100%;
	min-height: 500px;
	min-width: 640px;
	margin: 0px;
	padding: 0px;
}
#blue {
	position: relative;
	background-color: #0000aa;
	width: 100%;
	height: 90%;
}
#img {
	display: block;
	position: absolute;
	left: 50%;
	margin-left: -320px;
	bottom: 0px;
}