Center the photo box

- 把照片置中
- 把邊邊小小的白色縫隙取消

**Before**

![image](https://cloud.githubusercontent.com/assets/1153134/5518311/d4c02cb4-895b-11e4-83a0-2609546d2105.png)

**After**

![image](https://cloud.githubusercontent.com/assets/1153134/5518314/e59ea2d6-895b-11e4-89f3-459e0ff88264.png)