How do i create a Responsive Code Widget item? & Full length

Another Newbie Question im afraid.

Im attempting to embed a 3D scan of an area into my site. I can embed this using the code widget. the code the ‘programme’ has given me is this:

However, what i would like to do is this:

  1. Have the frame the full width of the site like every other part, OR centre it, with these dimensions its left aligned.

  2. Make it responsive when viewing at other breakpoints. (if i play with the ‘height’ and ‘width’, at different breakpoints it then is larger than the screen…

im sure it is something simple i need to change the numbers for, but im afraid i do not know.

Thanks in advance