A Dark Nord Material Theme for WallaBag based on the Nord Theme color palette: https://www.nordtheme.com
This CSS was created specifically for use with Stylish / Stylus (browser extensions) due to being much easier than creating the theme in WallaBag itself. Hopefully, the lazy fucks that develop WallaBag will eventually add it so it's a native theme, but I doubt it. It's already been years since people first requested a simple dark theme and they're in no hurry to add one.
To use it in Stylish/Stylus, paste the CSS as a new style, and use:
Urls matching this regexp, and enter: .*/wallabag/web/.*
Alternatively, you can just try adding it by clicking the style from the UserStyles page linked below (I'll have to try and remember to update it there if I ever update the code).
Other Links:
wallabag/wallabag#1521 (comment)
https://userstyles.org/styles/174836/wallabag-dark-nord-material-theme
Side Note:
I prefer to use the Stylus extension, as there is some URL monitoring done by Stylish (potentially spyware).
Screenshots:
