Originally Posted by HarryT
It's probably an awful lot easier to use the "Tweak Book" facility in Calibre to increase the width of the right margin.
"Tweak Book. Use the calibre feature Tweak Book to explode an unfixed format. Fix any problems in the relevant files with any HyperText Markup Language (HTML) editor. Then in Tweak Book preview the results and subsequently cancel or commit the changes. This method requires knowledge of format structure, HTML, Cascading Style Sheets (CSS), and regular expressions. I am not skilled or knowledgable enough for successful use of Tweak Book."
Cavets: But would need to be applied to each book... and so much less fun.