stage clipping on mobile

[slyi]

Expected Behavior

Actual Behavior

Steps to Reproduce

Steps to reproduce the behavior:

1. Go to 'https://scratch.mit.edu/projects/1217622680/' on a phone

Setting the canvas css to max-width:480px; width=100%; height:75vw seems to fix the display issues but the mousex and mousey incorrectly register adjusted coordinates

System Details

Production issue on both android and iphone

Screenshots
If applicable, add screenshots to help explain your problem.

[slyi]

Actually looking at the zoomed in version, the mouse x and y work correctly when the height and width values are hardcoded like on fullscreen mode.