div#preloader {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    width: 100%;
    height: 100%;
    overflow: visible;
    background: #3C4252 url('../img/loader.gif') no-repeat center center;
}

#preloader-grid {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    width: 100%;
    height: 100%;
    overflow: visible;
    background: url('../img/loader-grid.gif') no-repeat center center;
}