Hover effects are a terrible way of indicating if something is clickable, because you have to mouse over them instead of just looking at them. This problem was

Hover effects are a terrible way of indicating if something is clickable, because you have to mouse over them instead of just looking at them. This problem was already solved a long time ago by rendering inactive elements in gray. I'm not sure which GUI did this first, but the Apple Lisa (1983, first mass-market personal computer with a GUI) definitely did it.