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have you set the @page and body margins? i.e. set @page {margin:0;} and body {margin:0;} in the ePub stylesheet.
There is an oddity in the Calibre viewer where if you set @page {margin:0;} it is ignored and the default page margins used instead, but if you set @page {margin:1px} it will give a 1px margin which might be close enough.
Also, in the Calibre viewer, you might need to change your preferences so that the margins in the book are actually used. Untick the box: Preferences > Text layout in paged mode > Override the page margin settings specified in the book.
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