#underlay {
	position: fixed;
	height:100%;
	width:100%;
	background: rgba(0,0,0,0);
	top:0;
	bottom:0;
	left:0;
	right:0;
	z-index: 998;
	visibility: hidden;
	opacity:0;
	transition:0.2s visibility ease-in-out, 0.2s opacity ease-in-out;
}