html,body {
	width: 100%;
	height: 100%;
	padding: 0px;
	margin: 0px;
	overflow: hidden;
	background-color: #FFFFFF;
}
div {
	background-repeat: no-repeat;
	background-size: cover;
}
#mask {
	width: 100%;
	height: 100%;
	position:absolute;
	z-index:9999;
	display:block;
	background-color:#FFFFFF;
}