#loader-img {
    display: none;  /*Default*/
    position: fixed;
    top: 50%;   /*Relative to page*/
    left: 50%;
    -moz-transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -o-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);   /*Relative to self I think*/
    z-index: 100;
}