Curved edge of screen

I am making a subway surfers style game and I want to recreate the effect of the world sort of curving slightly instead of being completely flat it kind of curves, this similar effect is also in animal crossing.
I was wondering how could I achieve this?
Thanks to whoever responds!

This is achieved with a shader. Here is a nice tutorial using Unity’s shader graph to get you started: Unity animal crossing shader - curved world shader using shader graph - YouTube