This seems to be related to custom themes (or not having set up a GTK dark theme).
I switched to Plasma yesterday (thanks for the idea) and installed a custom dark theme and the same thing happens on my system:
The Qt UI is affected by the custom theme, but Anki doesn’t pick up that it’s a dark theme and uses the CSS variables for light mode in its webviews.
This is not an issue on Anki’s side. You can set light and dark theme manually under Preferences.
If you want Anki to automatically respond to your system, you’ll need to set the GTK theme separately, under System Settings > Application Style > Application Style > Configure GNOME/GTK Application Style (bottom right, see cursor):
If you choose a dark GTK/Gnome theme (like Adwaitha dark), Anki will automatically adjust:
@laddupeda A bit off-topic, but I found this awesome tool called Koi that allows you to automatically switch your custom Plasma themes/colors/icons and wallpaper depending on the time of day. You can get it from AUR.
