Here's a great tip from Andy Bell
A look at how display: contents is use to mimic CSS
A closer look at those properties and what they do
How to make CSS box-shadows look smoother and more realistic by layering multiple shadows on top of each other
Two methods for adding colour to CSS Grid lines
Telling the browser how to handle scrolling
Prevent jagged edges when using angled linear gradients
Create interesting shapes using only CSS border-radius styles
An in-depth look at CSS flexbox