Do you have physical brightness buttons? Do you have any more gradual transition hacks?

Our 2-yr old doesn't have access to phones at all -- except perhaps when he grabs one that's lying around; but then he expects it taken from him. But he's so taken with TV that we plan screen time in reverse: start at dinner time and subtract how much time we want him to be there. Our whole approach to tantrums is having something else lined up rather than just shutting things off and leaving a void. I'm fascinated by your methods.