#preloader {
    background: #000 url('images/loading.gif') no-repeat center center;
    background-size: 20%;
    height: 100vh; /* Set height to cover the entire viewport */
    width: 100%;
    position: fixed; /* Use fixed positioning to keep it centered */
    top: 0;
    left: 0;
    z-index: 99999; /* Set a high z-index to ensure it appears above other content */
}