Thanks for the feedback. That's not the game I'm working on at the moment, but I will go check that out and see what kind of scaling options I have. I don't remember how I scaled the play screen.
Viewing post in How do I set dimensions?
Oh, you did say it occured in every game you uploaded. While you are at it, I think you did something with the mouse cursor, that should not be done. It is showing the cursor but you use mouse as input for turning. And on screen edge, the cursor stops and you cannot turn further.
https://docs.unity3d.com/Manual/webgl-canvas-size.html
I still do not know any unity, but from that read it sounds like you decoupled the the render, but should not have done so, since you do want the automatic scaling.