:root {
    /*
     * Application layer order.
     *
     * The fixed site navigation intentionally occupies the highest
     * application layer.
     */

    --layer-base: 0;
    --layer-raised: 10;

    --layer-donation-bar: 1200;
    --layer-overlay: 1600;
    --layer-skip-link: 1900;
    --layer-navigation: 2000;
}