Why yes, create a custom css and put in the styletweaks folder, then find style tweaks in top menu and long press your custom one. It only needs a restart for KOReader to find this file.
On the other hand, book-specific ones are this book only. I usually test quickly on the fly which tweaks I need (cause it doesn’t need a restart) then migrate them into separate cas files (so I can turn them on/off independent from each other)
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