Flash alert background makes text unreadable

This flash alert came up when failing to cherry-pick a commit into a branch. The alert text should read:

Sorry, we cannot cherry-pick this commit automatically. It may have already been cherry-pick, or a more recent commit may have updated some of its content.

The offending line seems to be in sidebar.scss line 39, though I hesitate to remove it before determining why it was there in the first place.