It's still super early days for WordPress block themes, and Ganesh has a deep dive here on creating global style variations to customize themes.
https://css-tricks.com/creating-style-variations-in-wordpress-block-themes/
My mind doesn't automatically go to text-shadow for hover effects, but @ChallengesCss does... only he doesn't use the "shadow" part all that much.
https://css-tricks.com/cool-hover-effects-that-use-css-text-shadow/
The deep dive into CSS animations and transforms that @jh3yy goes into here is worth the read alone.
https://css-tricks.com/a-css-slinky-in-3d/
COLRv1 and CSS font-palette: Web Typography Gets Colorful by @hypeddev
https://css-tricks.com/colrv1-and-css-font-palette-web-typography/
Let’s Create a Tiny Programming Language by Md Suvo
https://css-tricks.com/lets-create-a-tiny-programming-language/
RT Axel Rauschmayer
Useful tools for creating AVIF images @the_jonin_ @css
https://css-tricks.com/useful-tools-for-creating-avif-images/
Useful Tools for Creating AVIF Images by @the_jonin_
https://css-tricks.com/useful-tools-for-creating-avif-images/
😎 Make a #CSS developer happy in 3 words:
How to Serve a Subdomain as a Subdirectory by John Siciliano
https://css-tricks.com/how-to-serve-a-subdomain-as-a-subdirectory/
Syntax Highlighting (and More!) With Prism on a Static Site by @AdamRackis
https://css-tricks.com/syntax-highlighting-prism-on-a-next-js-site/
Adding Custom GitHub Badges to Your Repo by Nick Sypteras
https://css-tricks.com/adding-custom-github-badges-to-your-repo/
Creating Realistic Reflections With CSS by @rpsthecoder
https://css-tricks.com/creating-realistic-reflections-with-css/
Creating the DigitalOcean Logo in 3D With CSS by @jh3yy
https://css-tricks.com/creating-the-digitalocean-logo-in-3d-with-css/
Setting Up CloudFront to Host Your Web App by @AdamRackis
https://css-tricks.com/setting-up-cloudfront-to-host-your-web-app/
Cool Hover Effects That Use Background Properties by @ChallengesCss
https://css-tricks.com/cool-hover-effects-using-background-properties/
Avoiding the Pitfalls of Nested Components in a Design System by Dan Christofi
https://css-tricks.com/nested-components-in-a-design-system/
Tell us you're a #CSS developer without saying you're a CSS developer. 🤓
Writing Strong Front-end Test Element Locators by @marktnoonan
https://css-tricks.com/front-end-test-element-locators/