I'm modifying a responsive Wordpress theme. At smaller viewport sizes, there is ~10 pixels of space between the edge of the main wrapper div and the right edge of the viewport. Take a look: http://bit.ly/1mt2s0D
How do I make it go away? HTML, body, and wrapper divs are all set to 100% width. Padding and margin are set to 0.
Other people have had this issue, but their solutions haven't worked for me. Here's one: Can't get a div background colour to fill full width of viewport.
Thanks.