Update post.html

Bigger text!

Before

![image](https://cloud.githubusercontent.com/assets/1153134/5563932/12e1bd3c-8ed9-11e4-9bd0-bce1d8bc0611.png)

After

![image](https://cloud.githubusercontent.com/assets/1153134/5563931/0de5bff4-8ed9-11e4-9d1f-0027faabce83.png)