Animated back to top button with CSS

[LITUATUI]

The idea is to show a back to top button only after scrolling with CSS.

This article shows some methods that only use CSS, no JS.

I especially like this method with a fading button.

What do you guys think?

[luizdepra]

It would be nice to have something like this.
If someone wants to help with that, please open an issue and send a PR. :)