title_body: How to remove white margins from ePub in Google Play Books Google Play Books seems to put a default white margin in every ePub being reading. But this is bad for making responsive covers in the first page. 
  
  Even with margin set to zero in both html and body tags, the Google Play Books adds an extra margin to the page. I was able to overcome this problem with hacks using negative margins, absolute postition and so on, but this can mess the view with others ebook readers.
  
  Is there a way to make hacks specific for Google Play Books in similar way that is webpages hacks for browsers? I couldn't find any documentation about it in Google Developers or IDPF.org.
upvoted_answer: You can use Sigil to change the margins and border by changing the style file. 
  If you have many files to change, you might be better of using Calibre's EPUB to EPUB conversion and setting the margins for the output file to your liking.
  
  If you don't have access to these tools and know about CSS, you can also unzip the EPUB files, change the style sheet by hand and rezip the files back into an EPUB. (This sounds more complicated than it is.)