#loader{
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: 1;
    position: fixed;
    left: 0;
    
    right: 0;
    top: 0;
    bottom: 0;
    overflow: visible;
    
    background: #000 url("preloader.gif") no-repeat center center;
    
}