#overlay {
	visibility: hidden;
	position: absolute;
	left: 0px;
	top: 0px;
	width:100%;
	height:100%;
	text-align:center;
	z-index: 1000;
}

#overlay div {
	width:300px;
	margin: 100px auto;
	background-color: #fff;
	padding:15px;
	text-align:center;
}