restyle feedback tab

related to <a href="https://ebi-forecast.igb.illinois.edu/redmine/issues/2307">redmine 2307</a> and <a href="https://ebi-forecast.igb.illinois.edu/redmine/issues/2306">2306</a>
Changed color, size and added script to hide tab. Changes can be viewed at http://pecandev.igb.illinois.edu/jk/ (login:testuser, password:123456).  
This and five other lines have trailing whitespace.  Try to remember to use
```
git diff --check upstream/master
```
to check for any extraneous whitespace you may have introduced on your branch.