Possible to make a full screen button?

Switch language to danish to find the Imagelinks placed further down the page. I’m using it for a map with some smaller points. I’d like to make a button to make it fullscreen but I’m not sure if that’s possible.

Since I’m using Elementor, I’ve tried using their popup builder to make a fullscreen popup with both full width and 100% margin. Neither the less, it doesn’t show up in the popup.

Any other suggestions to make a fullscreen button?

The page I need help with: [log in to see the link]