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

Before
![before](https://f.cloud.github.com/assets/48848/1508162/6f7ed770-49dc-11e3-8a53-aa3339773f9b.png)
After
![after](https://f.cloud.github.com/assets/48848/1508164/726fb1ac-49dc-11e3-8ace-3ec0c31c8be2.png)