Moodle Moodle 4.2 (Build: 20230424) Upgrading + Plugin Customization

I need the following tasks: 1. Upgrading my outdated Moodle 4.2 (after the back-up) with no issues (As I have some material). 2. I need a customization of the H5P (installed already) more particularily, the colors, font size. Example: https://www.youtube.com/watch?v=FWECrcFc5so 3. I have a problem with embedding activities (they are bigger than the required size) image 1 and similar 3 to 4 minor issues (need a solution to).