Spline responsive embed

Hello guys,

I am having difficulty in embed a 3D model made with Spline on my page. I am trying to change the size of the “html embed” element and its content to be responsive in various screen sizes.
I am starting to think this is not possible and that I need to add a new layout and a new template for each breakpoint.

Has anyone been faced with this problem?
A thousand thanks,
I leave the read only link here and the spline url …

Here is my site Read-Only: LINK
(how to share your site Read-Only link)