User blog comment:Sarah Manley/Updates to the Editor Redesign/@comment-477304-20110707224225/@comment-732225-20110714031621

Thanks Kirkburn, it works like a charm! Though using #F6F6F6 instead of transparent will make the entire article background transparent.

P/S: So this is not related to the new editor at all but I guess it's useful for wikis that have transparent background.