.full-size-stub-overlay:before {
    display : block;
    position : absolute;
    background: url("../img/ajax-loader.gif") center center no-repeat;
    opacity: 0.5;
    background-color: #DDD !important;
    width: 100%;
    height: 100%;
    z-index: 5;
    left: 0;
    top: 0;
}