Consider @media (prefers-color-scheme: dark) for themes

[Zerotask]

I'm using the theme dark together with a admin tree package which shows icons for drag and collapse.
This packages considers @media (prefers-color-scheme: dark) and shows white icons which I can't see with the green theme.

Therefore I suggest to adjust styles to consider this.
For example the background color of a table could be a dark(er) green instead of white, if you have set dark mode in your OS.