title: how to grey out the edges of a camera in unity
body: <p>I am working on a game in unity, and I am making a slow motion system where a player holds down a button and you will slow down time, but only until your bar runs out, I have that part down, but it looks a bit bland, so I want to make it so when I press the button, it will add like a grey overlay around the edges of the camera that fades as it gets closer to the center, how can I accomplish this?</p>