style in ckeditor doesn't match with frontend style

[adrianmak]

For example, the bootstrap clearfix css class doesn't work in backend ckeditor

[gebeer]

You need to create a file /site/modules/InputfieldCKEditor/contents.css with the styles you want to apply inside the Editor.

And have a look at /site/modules/InputfieldCKEditor/README.txt on how to activate it:

contents.css
============
Example CSS file for the admin editor. To make CKEditor use this file, go to your CKEditor
field settings and specify /site/modules/InputfieldCKEditor/contents.css as the regular
mode Contents CSS file.