How to maximize ubuntu free screen space?

Question

Gnome

Hello. I put ubuntu 16.04 on a laptop with a diagonal of 15.5 (in my opinion). In general, not so big, I want to optimize the workspace, I installed the docky panel (it seems to work fine). Installed gnome-session-flashback wrapper instead of unity. hide the panel. In general, a clean desktop, nothing superfluous, but here's the problem when working with the browser (and indeed) I often get to the edge and the panel climbs out. How can I make it appear not on hover, but on hover and pressing the super key (for example)