style update for blog

![blog](https://cloud.githubusercontent.com/assets/1494211/5394918/5a30b2e0-8143-11e4-89a2-8ce25dfc4d91.png)
![blogpost](https://cloud.githubusercontent.com/assets/1494211/5394919/5a374eca-8143-11e4-9b96-c9a6a4569f50.png)