File titles in MR are misaligned in IE11

Summary

All file titles are badly offset into the file body in IE11. They are also right aligned instead of left aligned.

Steps to reproduce

1. Open an MR that has some file changes.
2. Leave a comment on a line so that it shows up in the discussion timeline
3. Open the MR in IE11

Example Project

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31730

What is the current bug behavior?

The file title is misaligned and makes it difficult or impossible to review the file body.

What is the expected correct behavior?

The file title should be aligned to the top of the file, and the text should be left-aligned (generally).

Output of checks

This bug happens on GitLab.com