Re: codex - change fckeditor background color
To add to xavi's comments, at the site where I have 1.10 installed, even in the codex theme the fckeditor background color isn't purple, so I'm not sure if the code has changed between 1.10 updates or what. Anyway, like xavi said, a good approach is to use a tool to examine the page and find what CSS div is showing in purple.
-- Gary