How to navigate/ move userscreen over the map??

THE USER SCREEN SHOWS ONLY A PART OF THE THE MAP. THE IDEA IS THAT YOU CAN FLY OVER THE MAP LIKE A SIMCITY GAME. THE BUILDINGS ARE BUTTONS ON WHICH YOU CAN CLICK WHEN YOU WANT TO LOOK AT THEM.
THE START POSITION OF THE USERSCREEN SHOULD BE POSITIONED IN MIDDLE OF THE BOTTOM. WHEN GO OVER THE GRAY AREA’S THE FRAME SHOULD MOVE IN THAT DIRECTION!