#blocDiv {
    display: none;
    position: fixed;
    left: 0;
    top: 0px;
    height: 100%;
    width: 100%;
    background: rgba(0, 0, 0, 0.1) url(/img/load.gif) no-repeat;
    background-size: 5%;
    background-position: center center;
    z-index: 2000;
}