div#overlay{
    z-index: 99999;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    vertical-align: middle;
    text-align: center;
    background-image: url('/sites/all/themes/msasant2016_theme/images/spinner.gif');
    background-repeat: no-repeat;
    background-position: center;
}