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