Conpherence CSS tweaks.

Summary: Just a rough pass at the CSS on Conpherence. Need a second pass for the widgets.

Test Plan: Reload Conpherence, Chrome, FF

Reviewers: btrahan, epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4661