CSS

The ever evolving styles of the web. With the growing complexity of websites, frameworks becoming the norm and bundlers controlling the output of our production code there is a heck of a lot to learn and keep up with.

Articles

A solid animation guide from Matt Perry (@mattgperry). Useful to anyone regardless of whether you’re using Motion One or not.
Ahmed has wrote a great post for those wanting to familiarize themselves with min(), max() and clamp() CSS functions. I'm excited for this addition to the language and it will revolutionize responsive declarations.
A great article from @soMelanieSaid on using position sticky with css grid items. This was reference I used when positioning the sidebar content on this site.
The ultimate guide guide to flexbox. CSS tricks nailed this one and it's one of the best and easiest to understand guides out there
Another great CSS layouts guide from CSS tricks. I find myself referencing this a lot stored some snippets for easy access.

Smoother & sharper shadows with layered box-shadows

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Create smoother box-shadows with some techniques from Tobias. Philipp Brumm also created this tool inspired by the article. One thing I would love is if it created several box-shadow classes with varying sizes and strengths.
A comprehensive introduction on creating and styling Layout wrappers. I'm a big fan of this article because it covers a lot of use cases.

Twitter

@argyleink

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Adam Argyle is a great follow on twitter for anyone interested in CSS snippets, topping up your general knowledge and seeing what's on the horizon and being added to browsers.