Andrés González Tenorio

Suppose you have 4 nested div; that do not have a unique ID, because they are randomly generated and change from one user to another. Now you should assume that only one or two of the innermost divs (3 and 4) can be identified because they have a class that does not change and is unique. Something like what you see in the image that I have attached. I need to make changes to div "1" that contains the rest but does not affect div "2". How do I get there? I've been trying several options but I can't. I thank you if anyone could guide me. It is not very important because I managed to solve it in another way, but I am left wondering how to do it if I have another similar situation.