CSS Tricks
The CSS Tricks website has some interesting content and I have quoted and linked to it on many of my pages. It is one of the resources that I have listed as useful.
Chris Coyier is/was the author of the CSS-Tricks website. There are many articles of interest on the site. It has now been aquired by Digital Ocean.
CSS-Tricks was/is a good source for CSS information that you won't find directly by making searches.
As Chris says: