personal favorites

https://floor796.com/
https://xkcd.com/
https://www.web3isgoinggreat.com/

amazing design and crazy css

websites that push the limit of design and front-end engineering.
cdd 3d properties showcase
https://acko.net/blog/this-is-your-brain-on-css/
cools dude
css 3d widgets and effects
css 3d intro showcase
carnival target game made with css only

interesting

https://darkpatternstipline.org/