If you are using Calibre to reformat from epub to epub, try the following:
select convert books
verify input and output format = epub
select look and feel
select Filter Style Information tab
in the text box next to Other CSS Properties add font-size
I also add text-align, line-height, and font-family in the box(separated by commas)
This usually works.
If not it is time for Sigil. I have an older version of Sigil and have not kept
up with improvements since they dropped the Linux version.
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