Center nested block relative to parent

Question

css

Good afternoon.
I can hardly describe the problem in words (yes, so that they would understand).
I am attaching an image.

It is necessary that it be, as in option 1.
It turns out, as in option 2.
We are talking about HTML.
I will be glad to help. I know that the solution is somewhere on the surface, but I have not found it yet.
Thanks