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This video shows how to define the CSS that should be used to render content in the CKEditor wysiwyg as well as what styles are available in the “Styles” dropdown.
In the CSS section the first option is “Editor CSS”. This is where you can set what style sheet should affect the content of the wysiwyg. CKEditor comes with it’s own default stylesheet, but you can select another stylesheet if you want. (I’ll open a new tab to the create article page to see these settings in action.)