VimCheatSheet: Fixes #444

The CSS was referencing an ID instead of a class. I also removed style.css since it wasn't being removed.

Old:
![screen shot 2014-05-15 at 1 37 19 pm](https://cloud.githubusercontent.com/assets/81969/2988244/9bc48baa-dc57-11e3-80e9-d90695cc8a80.png)

New:
![screen shot 2014-05-15 at 1 37 08 pm](https://cloud.githubusercontent.com/assets/81969/2988247/a2c0a614-dc57-11e3-833d-65be4a1374f1.png)