"feature-last" for 3 features?

I am showing 3 features on “The One Pager”. However, the 3rd feature has a right margin like the first two. I’d prefer it to have no right-margin, like the “feature-last” on the One Pager demo. How do I do this?

I’ve set the number to 3 on the Homepage Features options area.

http://sadhanayogahudson.com/_wp/

http://wordpress.org/extend/plugins/features-by-woothemes/