#preloader {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 999999;
    width: 50%;
    height: 50%;
    overflow: visible;
    background: #f5f5f5 url('https://valparaisodegoias.sicult.org/home/assets/img/preloader.gif') no-repeat center center;
}