Update show-paste styles for better visual clarity and spacing.

Before:
![screen shot 2014-01-14 at 8 56 40 pm](https://f.cloud.github.com/assets/151829/1917038/4f9911a2-7d88-11e3-9bc7-738fc61552ff.png)

After:
![screen shot 2014-01-14 at 8 57 02 pm](https://f.cloud.github.com/assets/151829/1917039/5813eca8-7d88-11e3-96c1-0a612a7917b0.png)

Before:
![screen shot 2014-01-14 at 8 57 19 pm](https://f.cloud.github.com/assets/151829/1917044/685d8c7c-7d88-11e3-8e30-39cd40116542.png)

After:
![screen shot 2014-01-14 at 8 57 47 pm](https://f.cloud.github.com/assets/151829/1917047/7b5ac024-7d88-11e3-9bee-bddd65b59422.png)