Take the CSS for an small button and add all the variations you need. And after some time someone not so skilled like you arrives and adds a padding to the firs

Take the CSS for an small button and add all the variations you need. And after some time someone not so skilled like you arrives and adds a padding to the first button. That on scale it's not easy solvable. And that's the reason why we are looking for other approaches to isolate/share the main functionality.