Fix durable column content falling off the page

Summary: Fixes T7529. I think stylesheet order got juggled at some point and made this more specific, but we don't actually need it.

Test Plan:

• Column now looks reasonable.
• Everything else does too.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T7529

Differential Revision: https://secure.phabricator.com/D12084