Conversions: Use new CSS classes

These new CSS classes allow Goodies to work well with themes.

![3e2b0076-f7e3-11e3-9aac-fc21802a60cb](https://cloud.githubusercontent.com/assets/81969/3376544/23956aac-fbd6-11e3-880e-ff3bfda592f5.png)
![3e3a6d5e-f7e3-11e3-82e5-ffbfa8ce110e](https://cloud.githubusercontent.com/assets/81969/3376543/23951b88-fbd6-11e3-98ee-49000055d96e.png)
![3e17371c-f7e3-11e3-9a80-6ea1f58238ac](https://cloud.githubusercontent.com/assets/81969/3376545/239ae950-fbd6-11e3-9d67-c71a3e7d484e.png)