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I assume you know that you have to do at least an FFF 'Update EPUB Always' if not an 'Overwrite Always' to update the epub? And send it to the ereader again?
I don't think you mentioned your ereader type--if Kindle, you also need to convert the updated epub to azw3 before sending (or enable FFF's 'Automatically Convert New/Updated Downloads' checkbox before updating).
Or possibly delete it from the ereader and then resend it. I returned a Kobo reader several years ago because it didn't recognize updated files well.
Again, I'd have to see your epub to tell you anything specific about the CSS. And/or the format sent to the ereader.
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