Submission Form WYSIWYG (ckeditor) Background Colour

Hi there,I'm using the submission form pages to submit events on a site, the site uses a dark theme but the submission form when enabling the wysiwyg editor (ckeditor) the field background is white and there's no way to change this with css from what I can tell...Please can you help me resolve? It would look very strange to have this element in white.

Thanks,
Batman

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