Add a persistent scroll bar so the page doesn't jump / shift when 'Report bug' is clicked.
Merge pull request #107 from jeremychurch/remove-page-jump

Adding a scroll bar removes page jump
Make textarea a little bit bigger.
Merge branch 'dev.webcompat.com'

* dev.webcompat.com:
  Make textarea a little bit bigger.
  Add a persistent scroll bar so the page doesn't jump / shift when 'Report bug' is clicked.