Horizontal Scrollbar Hides the Last Line

If the viewed code lines are too long, an horizontal scrollbar appears, in Windows environments regardless of the browser (tested with Chrome and Firefox) the last line is hidden by the scrollbar.

Steps to reproduce:

1. Have a file added with some long lines.
2. Commit that file or create a pull request.
3. View (or comment) the code, having the vertical scrollbar at the bottom.
4. Attempt to view the last line.