how to integrate external style

Hi

Thanks for this wonderful tool.

I have a question anyway. I need to access the general style of the website as they are defined in the css, so the CK content reacts to it inside the editor.

Example:
<div class="content"> will call the class content, which is with black background and white font color. Inside the CK editor, this style remains unknown.

How can I do that?

Thanks again and cheers

S.L.