Design ideas:
- Blue border along the top and the two vertical sides of the screen
- No border along the bottom of the screen, as falling off the bottom of the screen leads to the players losing a "life"
- 20 pixels in total in height (for top border) and in width (for vertical borders)
- Lighter blue and darker blue lines add pseudo 3D effect
- Each highlight or lowlight is made of three lines of varying length, to create the pseudo 3D effect