setting for video player size

Hi

I’m evaluating the Tutor LMS against Learnpress.
Right now my biggest struggle is to get the video player into a ‘good size’ as right now, I have a header and menu on top pushing the player down below the screen, so the controls can’t be seen in the player window at all.

Surely, there must be a way to define the size which works best for my page?

I know there are a few suggestions to use a CSS code, but either that does not work or I paste it to the wrong location (currently using Elementor editor, from where I edit the course and add the css there, but that page is not the player page, so …. meeeh… )

I’ll wait for reply but look into other LMS systems meanwhile.