Of course, the current version of this website was also something I made. :)
I ended up designing and tossing a completely different site that leveraged CSS Grid quite heavily in favor of this design. Cross browser parallax is actually pretty hard! CSS has a long way to go, still! Or the companies that build some our browsers do, anyway.
In any case, I am not sure I would attempt such a feat again, especially as I am not a professional.
HTML and CSS. Code on Github