Dark mode would be great. I can even provide the CSS recommendations for a dark mode :)
I particularly feel that nextdns is abandoned, they no longer launch news and the look of the site, despite being functional, is dated, observe what adguard did, a much more elegant look and the light dark mode.
Just install an extension like "Dark reader" in your favorite browser and all the Internet goes "dark".
Jörgen Going out putting dark on sites that were not thought for this is not very cool, this type of extension is a palliative.