R1:7c80257a57db

Clean up Phame comment box CSS

Summary: Fixes some outlying issues with new comment box and Phame Posts.

Test Plan: Review CSS in sandbox, post new reply, see proper spacing.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16869