Hi Sophie315,

If it is a exists paragraph, then I suggest you set the inline style for this pargraph by default, so it will use the text color what you set for. but if this new paragraph needs create by the user, then can not achieve the default style for it. Another way is create a custom button for the editor toolbar which use to add this new paragraph, then you can handle the paragraph style, but this way needs the user to click on the custom button to add the new paragraph.

Regards,

Ken