I am not sure I understand how this theme css-files are supposed to work.
I downloaded one of the files (specifically, DARK THEME-jabrefdark-greytext.css) and entered its path into File / Preferences/ General / <the untitled field for file path> (selected Custom, of course). It had an unexpected result of changing the theme to... standard light one (that makes me think it is a fallback solution in case the css ist broken).
I tested it on Jabref 5.12 on Windows 10 and Jabref 5.7 (different path to the css field, but the same idea) on Lubuntu 20.04 only to get identical results.
Also, I checked some other dark theme chosen at random (not sure which one it was). Again, the same result.
I am not sure I understand how this theme css-files are supposed to work.
I downloaded one of the files (specifically,
DARK THEME-jabrefdark-greytext.css) and entered its path intoFile / Preferences/ General / <the untitled field for file path>(selectedCustom, of course). It had an unexpected result of changing the theme to... standard light one (that makes me think it is a fallback solution in case the css ist broken).I tested it on Jabref 5.12 on Windows 10 and Jabref 5.7 (different path to the css field, but the same idea) on Lubuntu 20.04 only to get identical results.
Also, I checked some other dark theme chosen at random (not sure which one it was). Again, the same result.