R1:f158b41d9c16

Tweak css

Summary: pick a value divisible by 3 and lose the moz stuff which is outdated poo.

Test Plan: looks good (to me) still...!

Reviewers: chad, epriestley

Reviewed By: chad

CC: chad, Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D8062