Layout of a non-standard layout grid?

Question

css

Good afternoon! Faced the following problem. At first glance, nothing special: landing page layout. Everything seems to be as usual, but the puff of the substrate (background) is divided into several blocks. And at the junction of two blocks there is a block with content. Actually the question is: how to do it? I apologize in advance if the question is trivial for you, but they could not solve the problem. I am attaching a screenshot of the page and the problem area.
Problem area: