R1:7f1c07973d9e

Clean up Hovercard CSS

Summary: Cleans up some wonkiness in rendering edge cases, like long titles.

Test Plan:
Test long titles and UI Examples.

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Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9433