
stackoverflow.com
https://stackoverflow.com/questions/26059228/hsl-o…
html - HSL or RGB (A) colors - Stack Overflow
HSL: hsl(10, 55%, 20%); Now hold your hand above it, like a couple of inches above the surface. Your hand's shadow now makes the desktop a bit darker, right? Now, it's impossible to represent this colour change in hex or rgb, without changing the colour itself. But in hsl, it's a absolute breeze— simply decrease the Lightness value, and bam!