Back in 2014, I was developing a personal web page and I decided to add something called flip card on the page (it flips horizontally when hovered)
https://w3schools.com/howto/...
It worked but was not feeling very "natural". I mean the flip thing was not giving "that" feeling. So I ended up a fine summer evening tweaking shadow, speed, z-axis, etc. And then the next day I deleted the whole project because it was taking a lot of my time. Mood swings. Moved on to Machine Learning and never touched CSS stuff again. Was a lot of fun though.