Graphs overflow into their right border on smaller screens
Currently the graphs use the span8 class which causes them to keep 4 columns of distance from the right (because the entire width is divided into 12 columns). On smaller screens this causes the graphs to overflow into their borders.
Using the span8 class makes it so graphs will always be underneath each other. Keeping this layout and solving the overflow issue is easy by just using the span12 class. This makes the graphs (and their borders) use the entire screen width.