Task(s)

• https://github.com/gitkraken/GitKrakenComponents/issues/298

Summary

• The branch column header text disappears when you have a hidden ref.

Summary of changes

• Adjusted CSS styles related with GK Graph headers.

Checklist

• I have followed the guidelines in the Contributing document
• My changes follow the coding style of this project
• My changes build without any errors or warnings
• My changes have been formatted and linted
• My changes include any required corresponding changes to the documentation (including CHANGELOG.md and README.md)
• My changes have been rebased and squashed to the minimal number (typically 1) of relevant commits
• My changes have a descriptive commit message with a short title, including a Fixes $XXX - or Closes #XXX - prefix to auto-close the issue that your PR addresses

Notes

• Those changes works with GK Graph PR: https://github.com/gitkraken/GitKrakenComponents/pull/299
• Changes are ready for review but I left this PR in draft mode as we need to bump the GK Graph library dependency version once above PR is merged.