You have three options:
- to import the page stylesheet in the content area, which is the default behavior of RadEditor
- OR to load your own CSS in the content area. You can do that via the CssFiles property to point to your own css file as explained in this article: Setting Content Area Defaults
- OR to not load any CSS in the content area. This can be done by setting the CssFiles property to point to an empty css file.
All the best,
the Telerik team
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