My "Order summary component"

Hello, this is my third time doing frontendmentor challenge, a few obstacles that I run into while doing this project are: How do I change the background image from mobile to desktop -> I know that I can use picture element and set a source image and it's media attribute to change the image but for background image, I'm kinda confused. The other thing I want to ask is how do I remove the scrollbar but keep all the body elements in the middle. Overall I think my code is fine but if there is anything that you want to suggest to me feel free to comment, thanks!.