Annotated Diagrams - Fixed image width

I see that the annotated diagram page fixes the width of the image to 400 px wide or 450 px high. I can see where to change this in the model_html5 page but would like a solution that doesn't require this underlying change as I suspect the page may not function as expected with a change to the max img size.

I'll also note that with the fixed image size, the image size is not responsive. So even if I change the underlying page then anything other than full screen will have things not looking right.