Fix missing line and shadow on static error pages [ci skip]

Before:
![before](https://f.cloud.github.com/assets/48848/1511195/043db66e-4aa6-11e3-9d4e-17c48c788d2d.png)
After:
![after](https://f.cloud.github.com/assets/48848/1511199/0db17672-4aa6-11e3-93e0-760556866c17.png)