styles error messages

Before:
![screen shot 2014-12-22 at 3 03 51 pm](https://cloud.githubusercontent.com/assets/730955/5530265/e9d05508-89eb-11e4-861d-6dd979c6fb7e.png)


After:
![screen shot 2014-12-22 at 3 03 36 pm](https://cloud.githubusercontent.com/assets/730955/5530268/edcecedc-89eb-11e4-8578-e8b07cba11d4.png)