Display three buttons named "Blue", "Red" and "Green" as well as a shaped like a square which should be black by default. When you click on any of these buttons it should change the color of the to the corresponding color.
Display three buttons named "Blue", "Red" and "Green" as well as a shaped like a square which should be black by default. When you click on any of these buttons it should change the color of the to the corresponding color.