pane.top = Header_height + Margin_above
        pane.left = App.screen.width/2 - 20*App.width(Em)
        pane.right = App.screen.width/2 + 20*App.width(Em)

  if Cursor_pane.col >= 1 then
    local pane = Surface[Cursor_pane.col][Cursor_pane.row]
    if pane then
      pane.top = Header_height + Margin_above
      pane.left = App.screen.width/2 - 20*App.width(Em)
      pane.right = App.screen.width/2 + 20*App.width(Em)
    end
  end