2019
https://css-tricks.com/re-pleasing-color-palettes/

https://greensock.com/tweenmax
https://codepen.io/GreenSock/pen/HxzEl

.green  { background-color:#6fb936; }
.orange { background-color:#f38630; }
.grey   { background-color:#989898; }

"#2C93E8"
"#F56C4E"
"#838690"

red   : #cb0f09
green : #058f31
blue  : #2479bb
yellow: #fdc109

red   : #e25655
green : #68c187
blue  : #6caee0
purple: #a397c9
yellow: #ffd42f

red   : #ff6663
yellow: #ffa737

orange: #fbc0a0
yellow: #feed91
blue  : #9fced8