Remove explicit height on .subtoolbar and fix background on selected menu item.

With a fixed height on .subtoolbar menu items disappear on iPods, iPhones etc. (all devices narrower than 444px).
Browsers display it jsut fine without the height set.

I also changed a padding by one pixel, which makes the circular background fit inside the container and not be cut off.

![pullrequest](https://f.cloud.github.com/assets/3637499/1345643/f1bb776e-3692-11e3-8ea2-45de1314b1ab.png)