Add absolute class to fix styling issue

Problem: No scroll, so button to create checks is inaccessible on certain screen resolutions:

![image](https://f.cloud.github.com/assets/1064715/1271080/18f9ce66-2d15-11e3-8279-57f25cc29d3b.png)

Solution: Change divs to absolute, allows scrolling

See it in action here: http://tranquil-ocean-1950.herokuapp.com/ (Note will die after 48 hours)

Not sure how you feel about styling changes, but this would be really useful :+1: