Indesign was meant for paper (and by implication PDFs which really are only proofs of paper). The epub support is a fudge and produces ghastly stuff.
Far better to use a Wordprocessor. Use Styles. Totally trivial to set top margin, left, right, first line and bottom.
Then Sigil or Calibre to convert a docx to epub.
Then the above example is totally automatic converting docx to epub if the margins are set in pt. The convention is 12pt = 1em. Almost all rendering engines use that if the CSS is in points.
Last edited by Quoth; 10-21-2020 at 02:00 PM.
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