#loading {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-image: url(loading.svg);
    background-position: center;
    background-size: 80px;
    background-color: rgba(0,0,0,0.2);
    background-repeat: no-repeat;
    z-index: 999;
}