#loading-bg {
        
        width: 100%;
        height: 100%;
        position: fixed;
        top: 0;
        left: 0;
        background-color: rgba(0, 0, 0, 0.4);
        z-index: 500;
    }
        
    #loading-image {
        
        position: fixed;
        top: 50%;
        left: 50%;
        margin: -25px -25px;
        z-index: 510;
        height: 50px;
        width: 50px;
    }