Follow-up from "Restyle changes header & file tree"
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=202030) </details> <!--IssueSummary end--> The following discussion from !23665 should be addressed: - [ ] @pslaughter started a [discussion](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/23665#note_282444584): (+1 comment) > **suggestion (non-blocking):** Could we consider making this `auto`... It currently looks like this for me: > > | Before (currently) | After (with `overflow-y: auto`) | > |--------|-------| > | ![Screen_Shot_2020-02-04_at_1.15.48_PM](/uploads/1043eafc22e80f3e6b1437bad150ba4b/Screen_Shot_2020-02-04_at_1.15.48_PM.png) | ![Screen_Shot_2020-02-04_at_1.15.31_PM](/uploads/6a0c94cb9c93dcd4c1270dcbbff4dcae/Screen_Shot_2020-02-04_at_1.15.31_PM.png) |
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