CSS variable --pswp-preloader-color is defined but seems not to be utilized

[porg]

/assets/ps5/lib/photoswipe.css contains:

--pswp-preloader-color: rgba(79, 79, 79, 0.4);
--pswp-preloader-color-secondary: rgba(255, 255, 255, 0.9);

• But they seem to have been just created but not (yet) utilized.

• Loading the demo page loading-indicator-preloader in your browser and then modding those CSS variables in DevTools yields no visible change.

• The preloader icon (aka "spinner") seems to use simply the --pswp-icon-color.