Wow! Thank you so much @GreenSock! I have a couple of questions on how you were able to achieve this:
In the JS file for 'let backg', how come you put "backgroundImage" instead of "background"? I initially thought it would be "background" because that how the radial gradient background is assigned in ".about_backg".
Also, how is .header_background_extender coming in to play here? I might be mistaken, but I don't see the class called outside of its declaration in the CSS file.
Thank you!