Stuff that used to be really hard is now a lot easier, and can be handled in just a few lines of code instead of many. Cross-browser support is great, too!
The amazing Stephanie Eckles from Modern CSS has put together an incredibly useful cheat sheet of tiny code snippets for modern CSS layouts and components called SmolCSS.
This is such an amazing resource, whether you’re just learning CSS or have been using it for years. Check it out at SmolCSS.dev.