Github user soralee commented on the issue:
https://github.com/apache/zeppelin/pull/2371
### 4. (bug) didn't revert original color when I click a navbar icon and
escape.
it is same bug with
https://github.com/apache/zeppelin/pull/2401#issuecomment-307058027 as well.

And I fixed a commit :
https://github.com/apache/zeppelin/pull/2401/commits/762635d09c879233cd498440e9f8b36d2e8c6988
although the two contents are in one commit, I hope it would help you.
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