void mouseEntered(int ex, int ey) {
			if (exitButton.contains(ex, ey)) {
				exitButtonColor = Color.gray;
				coolButtonColor = heatButtonColor = Color.lightGray;
			} else if (heatButton.contains(ex, ey)) {
				heatButtonColor = Color.gray;
				coolButtonColor = exitButtonColor = Color.lightGray;
			} else if (coolButton.contains(ex, ey)) {
				coolButtonColor = Color.gray;
				heatButtonColor = exitButtonColor = Color.lightGray;
			} else {
				mouseExited();
			}
		}