User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-5489931-20201227080450/@comment-44807868-20201227111851

The color issue appears to be that the tables using  class are having the   attributes overridden on UCP for some reason. Maybe you can to see if anything can be done about this behavior. Otherwise, there're two solutions to this that I can think of: You can see both working there. I definitely understand that doing either of the both manually would be tedious. Automating the edits making such change through a bot would be a faster and easier choice. So if you do go with either one, you can look into Help:Using AutoWikiBrowser and seek more detailed instructions for automating this at the Discussions! 🙂
 * Replace  with inline CSS (e.g.  ) for all tables. FYI,   has been deprecated since ages and hence is recommended to be avoided, so I'd recommend this.
 * Replace  class with.

And both font size and width seem to be working fine for me? Can you show a screenshot, perhaps?