Background of CKEditor is black for authenticated user I am using the CorporateClean theme for Drupal 7.15, and I have an issue using CKEditor with this theme. 

When an authenticated user writes some content, the background of the CKEditor text editor (the area where the user can enter and format text) turns black. I do not have this problem when login as the admin. I also do not have this problem if I remove CKEditor. 

How can I change this background?
Do you have Firebug installed (extension for Firefox) ?
With Firebug you can inspect element and see what css definition makes it black.
Then, in your theme css file you can override that settings by writting your own definition to make it white. like

.ckebackground {
background-color:#ffffff;
}


where ckebackground is "problematic" class that makes it black.