This is the resource that Una Kravets said we’d put in the show notes on JS Party #176. I thought it was worth a direct linking in News as well, since it’s so freakin’ well-done and useful:

You’ll learn CSS fundamentals like the box model, cascade and specificity, flexbox, grid and z-index. And, along with these fundamentals, you’ll learn about functions, color types, gradients, logical properties and inheritance to make you a well-rounded front-end developer, ready to take on any user interface.