Customize PDF reader using Zotero Night Theme

Hello everyone,

I am new to Zotero and am currently trying to customize the theme. Therefore, I'm using the Night Theme ( and playing around with the night.css file. So far, I could customize almost everything except the colors and font of the PDF Reader. No matter what I do, the reader stays in the Nord Theme style (as intended in the Night Theme plugin). Can someone tell me if it is possible to customize the PDF Reader via CSS or any other way?

Thanks and best regards
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