Ok - as a random example, I downloaded this epub from the MR library:
https://www.mobileread.com/forums/sho...d.php?t=251459 and imported it into calibre.
Then: open the conversion dialog, set output format to azw3, click "restore defaults", and in Look & Feel, I enter
in the Extra CSS tab.
When I open the converted azw3 in the calibre editor, I see that the last html file in the "Text" files is a table of contents that isn't there at the end of the epub. The Extra CSS I entered above is in the 0003.css file. The 0003.css file is linked
only by this final html toc file, so doesn't have any affect on the rest of the book.
Is this normal? Am I doing something wrong here?