I’ve made a few tweaks regarding the light and dark themes, so it’s easier to maintain for admins and easier to configure for users.
There should be almost no visible changes (the header icons are darker than before on dark mode, I don’t think there are other changes).
In your preferences, there were three different fields to configure the interface colors, now there is only one.
If you experience visual issues, have a look at your preferences and set the color palettes as you want: https://unicyclist.com/my/preferences/interface
If you still face issues, please report here 