Is the site http://twitter.github.com/bootstrap/ http://twitter.github.com/bootstrap/ using Bootstrap? When view on iPhone, there is a thin white margin for the

Is the site http://twitter.github.com/bootstrap/ http://twitter.github.com/bootstrap/ using Bootstrap? When view on iPhone, there is a thin white margin for the right border. This white border stays even if you double tap on the screen, which normally means the site will expand to fill.