Cleanup diff-notes-collapse css
What does this MR do?
Clean up diff-notes-collapse css in preparation for https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14061
Are there points in the code the reviewer needs to double check?
Make sure it's pixel perfect
Why was this MR needed?
Improve CSS
Screenshots (if relevant)
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Does this MR meet the acceptance criteria?
- Review
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Has been reviewed by Frontend
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What are the relevant issue numbers?
Edited by Clement Ho