PublicDNS: Changes to make styling consistent with new look ddg

Lo,

As has become my weekend custom recently; some styling changes on an existing goodie!
Should address: https://github.com/duckduckgo/zeroclickinfo-goodies/issues/528

![image](https://cloud.githubusercontent.com/assets/978048/3487543/9206c46e-0486-11e4-83e5-ad40a4c09627.png)

Feedback welcomed @chrismorast @jagtalon