Title says it all
Of course, low prio, but if we offer darkmode it’s orth a look I’d say
Unfortunately forum does not support separate logos per theme, so need to have one image for all themes… 
That’s probably ok in this case. Our image is a .png with invisible background, so we could make the background gray or white (and a little bit bigger) and be done with it. I used this html
<img src="https://forum.kurviger.de/uploads/default/original/1X/f0caa7a1a26b98047cac63581a47ffd8fa05ee3a.png" alt="Kurviger Forum" id="site-logo" class="logo-big" style="background-color:gray;">
which makes it look like this:
As I said, maybe a little bit bigger…
In my opinion, the logo looks quite OK in dark mode like it is now. It shouldn’t be too dominant (but it would be if using a grey background).
A non white or black background will make the logo ugly in both themes.
At least one theme could have the logo with its native background color.
So an option can be white background, but could be too prominent then.
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Having background in logos (regular + small) is ugly, so I used gray color.
Please see if you find them usable in both themes.
Or else my suggestion is to remove the images and let forum handle them with own resources which play everywhere correctly.
Eventually we were able to use separate images per theme, though needed an extra extension. 
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FLIPPING AWESOME you guys