.overlay
{
	width: 100%;
	height: 100%;
	position: absolute; 
	top: 0; 
	left: 0; 
	display: none; 
	z-index: 999;
	background: rgba(0,0,0,0.7);
}
	.overlay a
	{
		display: table-cell; 
		vertical-align: middle; 
		text-align: center;
	}
		.overlay img
		{
			padding: 10px;
			-webkit-border-radius: 10px;
			-moz-border-radius: 10px;
			background: #ffffff;
		}

.overlay:target { display: table; }