Have a look at the Page Colour set for the document in Word, on Word 2016 it's in the Design tab. Default setting is "No Colour". I'm not sure if/how calibre DOCX Conversion handles this setting - but that's where I'd start. Or, maybe there's a Page Border defined.
Try saving it as a PDF in Word and see what that looks like, if it has a similar border, find out why and fix it in Word. IMO it's always better to resolve problems in the manuscript copy rather than fixing them within conversion or by editing the epub code.
BR
Last edited by BetterRed; 05-06-2018 at 08:52 PM.
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