Best practices for this layout

Hi, I am making a slider which I want to look something like this.
I have no problems with the background image, but I’m wondering what would be the best practices for laying out the box with the items inside?
In essence my question would be: if you have a container, and inside want to stack a few items on the left, but only have one item on the right, but then also want a background box extending behind both, what is the best process?

My guess thus far is it be a div for the transparent box, then putting columns inside that div, then stacking divs in the left column and just one div in the right column?

Thanks for the help, super newb here!