So the “success color” seems to be the actual little box that says “answer.” What is changing the background color of the actual answer? None of my colors are this blue …
Best answer by bjoern_schulze
Apparently this is a bug that is currently being fixed. The expected behaviour is that the success color is being used for the best answer (the comment itself as well as the pinned solution under the question). But right now some other color is being used instead.
In the meantime you can use Custom CSS to override the wrong color, like