#preloader {
    display:none;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999;
    width: 100%;
    height: 100%;
    overflow: visible;
    background: rgba(0, 0, 0, 0.6) url('/img/preloader.gif') no-repeat center center;
}

.hide-block {
    display: none;
}