Ian Tindale
CodePen.IO 
RT Tom Hinton
Ludicrously early but here’s my #WCCChallenge on the theme of "⬛#000000FF, ⬜#FFFFFFFF, 🟥#FF0000FF"
https://codepen.io/TomHinton/pen/oNEBYqY
@dgar there’s also #000000FF and #FFFFFF00 (alpha values – legit, for CSS https://www.w3.org/TR/css-color-4/#hex-notation)
うしがらいい猫 