Make 'Nodes Cool' smoother

To stop it from jumping a bit, also no JavaScript.

Before

![beforegif](https://cloud.githubusercontent.com/assets/1153134/4007869/d9bfa4f4-29cc-11e4-9c72-30e88eb55da5.gif)

After

![aftergif](https://cloud.githubusercontent.com/assets/1153134/4007871/dabaf05c-29cc-11e4-80b2-1ef7aca9acfe.gif)

cc @jlord