.stone-loading {    
    background-image: url("http://www.lettersmarket.com/uploads/lettersmarket/blog/loaders/common_metal/ajax_loader_metal_512.gif");
    background-color: rgba(220, 220, 220,0.8);
    background-size: 25px 25px;
    background-repeat: no-repeat;
    background-position: center;
    width:100%;height:100%;position:absolute;top:0;left:0;z-index:999999;
}