SUMMARY
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Currently, the only way to get dark mode on Alligator is to set Plasma to a dark theme.  This option doesn't work if the user is using a gtk-based desktop, or if the user wishes to use a light-themed desktop but a dark-themed Alligator.  

I believe there should be an option to use breeze-dark colors independently of the desktop theme, similar to Kate and Okular.  Such an option would make Alligator accessible to people who need dark mode but aren't using Plasma.
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STEPS TO REPRODUCE
1. Use a gtk-based desktop 
2. Attempt to set Alligator to use dark background and light text 

OBSERVED RESULT
There is no way to switch Alligator to use any sort of dark theme.

EXPECTED RESULT
There should be an option similar to other KDE apps to use breeze-dark colors.