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@doremifaso From the way it sounds, I believe that the css file in your epub may have the font size set at a constant size (12pt, etc) instead of a relative size (% or em). If this is indeed the case, there are probably many different tags with a specified font size, such as h1-h6, p, div, etc. and it would involve a bit more than what a simple change in the custom css can do.
If you would like, PM me with the contents of the embedded css file for that epub and I will take a look at it
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