Click the green flag (or press space after that) to spin the wheel. Once its spinning, wait for it to stop. Whatever color you get will be displayed as the background and a corresponding cloud variable will go up by 1.
Be free to use any of the code in this project without giving credit. I know how tedious to make all the things corresponding with the colors happen. I recommend clicking the green flag to spin again, because if you click the green flag then the text saying the previous spins result will disappear.