So many amazing things coming to CSS these days, but I have a feeling anchor positioning is going to be one that gains traction pretty quickly because it solves such a big pain point and is pretty easy to use.
Explored it in this video:
Browser support is far from perfect atm, but as I show in the video the polyfill is great. 
GitHub
GitHub - oddbird/css-anchor-positioning: Polyfill for CSS Anchor Positioning
Polyfill for CSS Anchor Positioning. Contribute to oddbird/css-anchor-positioning development by creating an account on GitHub.
