The cart modal in the sidebar, which gets into the container with the background popping out, how to implement it correctly?

Question

css

I can’t figure out how to correctly implement a modal on the side that will go to the entire width of the remaining screen, but at the same time its content will clearly fall into the bootstrap container

jsfiddle.net/98x4o3bf/6

In fact, I solved the problem, but I think that you can do it more correctly