offthewallsocial on "Twenty Thirteen Right Margin on Mobile Devices"

On mobile devices, the Home Page, and any posts are all showing up with large right margins. The pages all seem to be full width, though.

I followed the advice given in a now-resolved thread here: http://wordpress.org/support/topic/twenty-thirteen-margin-on-mobile-devices?replies=21

and added this to my child theme css

.site-info,
.site-footer .widget-area {
 width: auto;
}

It hasn't resolved the issue of the strange side margin on mobile devices.

The site I'm working on is http://mignonnehedgehog.ca

I've tried it on iPhone and iPad, and I'm getting the same results.