#tweet
{
	display:none;
	position: absolute;
	top: 0px;
	left: 0px;
	width: 100%;
	height: 100%;
	background: rgba(185, 185, 185, 0.2) none repeat scroll 0% 0%;
	text-align: center;
}
#tweet > a
{
    position: relative;
    top: 50%;
}