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I have some property values for certain CSS rules that I would like to change using Convert for several files (like 139 epub files, give or take a few).

For example, one of them is to change all the CSS rules called CCN for the properties, margin-top and margin-bottom, from 1em to 0.

Another one I'd like to change is all the CSS rules called FHM, property margin-top, from 6em to 1em.

These are just two of about six different values I'd like to change using Convert.

Is there any way to do this in the conversion process, or is using Edit Book the only way to change these values?

Thanks for any help!