/* ----- Menu Follow -----*/
<style type="text/css">
    html,body {   
        padding: 0;   
        margin: 0;   
        width: 100%;   
        height: 100%;             
    }   
    #overlay {
	position: absolute;
	top: -21px;
	left: 0px;
	background: #ccc;
	width: 100%;
	height: 100%;
	opacity: .75;
	filter: alpha(opacity=75);
	-moz-opacity: .75;
	z-index: 999;
	background: #fff url(http://i.imgur.com/KUJoe.gif) 50% 50% no-repeat;
    }   
    .main-contain{
        position: absolute;  
        top: 0px;   
        left: 0px;  
        width: 100%;   
        height: 100%;   
        overflow: hidden;
    }
    </style>