Just purchased and installed the User & Comment Mentioning addon and the Frontend Moderation addon and they do not use the dark styling even though that is what is set for the comment system.
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Styling does not match dark mode
Apologies, found the styling for Frontend Moderation but still no luck for User & Comment Mentioning and Comment Author Info addons
One last thing, I am also getting this white box in the bottom left of all pages on my site now.
Here's an example page where you can see: