Summary: General CSS and usability touchup of the Remarkup bar states for fullscreen and preview. Larger fonts, more spacing, some hint of the underlying page. Disable buttons that can't be used in preview mode.
Test Plan:
Formal test coming with mobile, browsers. This is a kick the tires upload.
{F4283448}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Differential Revision: https://secure.phabricator.com/D17563
76404c5fdb