iMovie 10.2.4 intriduces some new backgrounds that are comprised of two colors and can be customized to use any two colors you like. You can use these as standard backgrounds, but also as overlays mixed with a variety of iMovie tricks to create special effects.
Want to know more about how to use iMovie on your Mac? Check out this MacMost course!
i did it on a macbook rentia early 2015 it was insane!!!!