CKeditor 5 Background Color Change - themes

So im looking to change the background colour of the text area on CKeditor5, iv tried doing it inline, using a css file but it doesn't respond.
I found this guide
https://ckeditor.com/docs/ckeditor5/latest/framework/guides/deep-dive/ui/theme-customization.html
But I don't understand what its saying? or feel its telling me where and how to implement this. Is anyone aware of a working demo of this or could show me how to do it?
Thanks for any help in advance - Greg

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