Layers transition correctly

This time it handles scrolling. No need for scroll top.


![layers-with-scroll](https://cloud.githubusercontent.com/assets/814861/5318024/588c795a-7c94-11e4-955d-e726e5096061.gif)

and now this close  doesn't line up with  the `var`  and  it feels like not  everybody in the room is  wearing trousers.