fix for rendering inconsistencies

fix for circles getting cropped at some screen widths when transform animations are used in the banner ad

![image](https://cloud.githubusercontent.com/assets/960919/4357065/3218e322-425f-11e4-8aa7-fd8b9a4da772.png)

![image](http://media.giphy.com/media/LZaNrkOLxI5Yk/giphy.gif)

// @austinh7