Remove extra prerequisites style and class

@frrrances - here's a PR for fixing that weird styling difference.

Before:
![screen shot 2014-11-04 at 11 52 05 am](https://cloud.githubusercontent.com/assets/3364609/4907992/36610f30-6466-11e4-83c4-45cc89d4092b.png)


After:
![screen shot 2014-11-04 at 11 52 17 am](https://cloud.githubusercontent.com/assets/3364609/4907995/3b038a4a-6466-11e4-99bf-71ac853b6377.png)

We prefer to write styles for specific classes, rather than base elements. The `li` here should have a class. You could also probably just style a class, omitting the `li` for better reusability.

Example: `.important-date-item` instead of `li.important-date-item`