Quote:
Originally Posted by cybmole
I know that if I have a poorly formatted epub where the L/R margins are either too wide or are completely missing ( i.e. where text runs right up to bevel on reader), then an epub-to-epub convert will fix it
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Jackie_w already explained how calibre keeps the letters off of the very edge. Calibre also gets rid of wide margins utilizing the Remove fake margins (this may be a default setting) setting under Preferences - Common options - Structure detection. I believe this seeting causes calibre to look for and remove and left or right margins that are set for 90% or more of the paragraphs.
So if your book uses calibre4 for all regular paragraphs and the css for calibre4 gives a left margin of 2em having this setting checked will alter that margin to 0em. Also I believe this setting checks for page templates and alters them in a similar fashion.