If you would like to keep the Internal Elements in check with the others, I would suggest you Split the main sections and play with the ratio, and for further micro-control, use the “inner section” widget.
For a responsive design that will work on all screen sizes, choose the VW and VH values, as they are relative to the entire screen size.
Read more here:
https://elementor.com/help/whats-the-difference-between-px-em-rem-vw-and-vh/