Invert the colors on the alerts for readability

I don't really like the way I solved this but it works. Does anyone have a more semanticly correct way of doing this?

![screen shot 2014-11-04 at 09 47 52](https://cloud.githubusercontent.com/assets/554766/4896820/8dea3aa4-63ff-11e4-85e8-d4016706cf4e.png)