Move gray control bar on top of energy chunk layers, see https://github.com/phetsims/energy-forms-and-changes/issues/148
Move gray control bar on top of energy chunk layers, see https://github.com/phetsims/energy-forms-and-changes/issues/148

phetsims/energy-forms-and-changes,phetsims/energy-forms-and-changes,phetsims/energy-forms-and-changes