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The CSS you have only works if the book text is in paragraphs. That's a perfectly reasonable assumption, but publishers are sometimes quite bad at doing The Right Thing. Some books may actually be in <div> or <span> tags instead. The universal selector (which I despise) should catch these cases, but try a more specific selector like "p, div, span, td, li, blockquote" and see if that works.
It wouldn't surprise me if the device settings took precedence over any CSS though. If a book uses rules with !important, device rules need to override that for the sliders to work as expected. Try the CSS (with a selector similar to mine or the universal selector) on a new book that you've never made settings changes in.
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