I suppose if you wanted to go whole hog, you could take a similar approach to what Australian law mandates for cigarette packaging: set the background to unplea

I suppose if you wanted to go whole hog, you could take a similar approach to what Australian law mandates for cigarette packaging: set the background to unpleasant shit brown and have images of the corpses of people involved in texting and driving accidents and social media provoked suicides, with warnings in huge white letters like "DEVICE OVERUSE CAN KILL" or something.