iframe.float {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    border: 0;
    z-index: 999999;
    /*opacity: 0;*/
    display: none;
    background: white url("https://cdn.csu.edu.au/__data/assets/image/0004/197617/ajax-loader.gif") no-repeat center center;
}