#loadingOverlay {
    position: fixed;
    inset: 0;
    /* top:0 right:0 bottom:0 left:0 */
    display: none;
    /* JS toggles this */
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.6);
    z-index: 4000;
}