Minor Differential CSS
Summary: More Diffusion/Differential touch ups, ToC, etc.
Test Plan: Look at colors, see that they match or look better.
Reviewers: epriestley, btrahan
Reviewed By: btrahan
CC: Korvin, epriestley, aran
Maniphest Tasks: T3952
Differential Revision: https://secure.phabricator.com/D7386