I would like to edit the CSS in the .mobi file created when I export Reflow to Kindle.
I understand the CSS itself
However, when I edit the .mobi file it is no longer recognised as a valid eBook by a Kindle device
I assume there is some kind of checksum involved.
Does anyone know:
1) How to edit the .mobi file and ensure it stays as a valid file format
or...
2) How to edit the default CSS template that is being used for the .mobi file (i.e. prior to export)