Orientation of screen #224

I have a requirement to develop a web app to run on TVs in portrait, but the web app running is a landscape and by the user's view it is portrait orientation.

I need to use canvas confetti but the particle's gravity is going sideways. How can I fix this, is their any existing option that helps achieve my goal? or if now can someone explain what to do inorder to achieve that so that I could contribute the feature if needed