With some themes CKEditor in Drupal does not work right by default, e.g. where the background in the text-field is to dark. For the Marienelli theme, the solution is presented here:

 http://drupal.ckeditor.com/tricks.

But the same problems show up with this theme as well; Absynthe

The added code in the ckeditor.config.js-file regarding the Marienelli theme is: 

config.bodyClass = 'singlepage';

config.bodyId = 'primary';

config.extraCss += "body{background:#FFF;text-align:left;font-size:0.8em;}";

config.extraCss += "#primary ol, #primary ul{margin:10px 0 10px 25px;}";

The only difference in the Absynthe-theme to Marienelli is in the first two lines:

config.bodyClass = 'main';

config.bodyId = 'clearfix';

Well, everyone could have imagined that, looking at the source code in Absynthe. But since I already have done that, I can as well share it with you. 

(more...)