Responsive CSS on charts page.

Originally, the number note bubbles were taking over the text in the next chart. 

# Before
![before](https://f.cloud.github.com/assets/1558388/1558442/97b55016-4f90-11e3-8299-4304641f55d8.png)

# After
![after](https://f.cloud.github.com/assets/1558388/1558443/a18adc1e-4f90-11e3-9b42-2a2c9dcb46db.png)