CKEditor: Class or ID for editor body

Question

I have an instance of CKEditor on a page. I am trying to give the CKEditor's body a class or ID so it matches some styles I have defined in a stylesheet.

There is a API documentation that should give access to the respective DOM elements, but I can't seem to get it working. All objects I try to query that way turn out undefined.

Does anybody know how to do this, or how to properly address CKEditor's dom elements?

Edit: Thanks folks, nemisj's answer did it for me but for some reason, I don't get to set the "accepted" checkmark in this question.

Answer 1

Although that part of the API wasn't ported from 2.x at the time that this question was placed, now it's easier to use the bodyId and bodyClass config options.

Of course, the explanation by nemisj is good and can be useful for other things, but you must remember that each time that you switch away from design (to source view), the iframe is destroyed, so you'll need to reassign your attributes if you do it manually.