Article preview component solution | CSS vs JS

I already knew how to do it with CSS only. That's why Share button implemented in three different ways - with and without JS. You'll see :) Question: Do I really need JS here? Is this the best way and why? PS: the way the button is displayed on small screen is the same in all files, of course I could do it without JS too, but I got a little lazy :) I will be happy to receive any feedback and useful advices!