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I will look into this but Preview's background and text are controlled by the css code you inject.
Preview is not a full fledged e-reader. There is an Preview Icon to rapidly cycle through multiple user controllable css stylesheets for Preview to quickly "preview" pages in both light and dark modes.
FWIW, some images do not look good no matter the media queries settings under both light and dark mode. So epubs are normally designed for one mode or the other as very few real ereaders can handle both.
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