#loader {
    display: none;
    position: fixed;
    background:#e9e9e9;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    opacity: 0.5;
    z-index: 997 !important;

    height:100%;
    width:100%;
}

#loader > img{
    position:absolute;
    left:50%;
    top:50%;
    z-index:999 !important;
    margin: -75px 0 0 0;
}