I really like how simple it is to get color variations with HSL and Custom Properties, as explained by @HaulPebert@twitter.com (first time I notice the initials are fliped 😅):
https://cloudfour.com/thinks/hsl-a-color-format-for-humans/#hsl-colors-unlock-new-coding-opportunities

Or @MaximeHeckel@twitter.com:
https://blog.maximeheckel.com/posts/the-power-of-composition-with-css-variables#defining-meaningful-colors-through-composition

However…