Thanks for the suggestion, but setting the margins to 1px (or 1pt or 0) doesn't stop the margin commands from being added. It simply makes the margins very small. But the css is still added.
The only way I've figured out how to get what I want is to unzip the epub file, open the css stylesheet and manually delete the margin commands that Calibre has added, then re-zipping it.
I'm just wondering if there's a way to stop the margin commands from being added in the first place.
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