https://codepen.io/sourrain/pen/MWyEJxm?editors=1100
JavaScript API: Blotter
https://youtu.be/xnqll2Uz2p0

vector art
https://agentpekka.com/artist/cruschiform/
https://dribbble.com/AdrianFernandez/projects
css color:
https://cssgradient.io/
flexbox:
https://css-tricks.com/snippets/css/a-guide-to-flexbox/

chrome plugin網頁外掛吸取顏色:
colorzilla
Html css js 寫出shader:了解基礎
https://thebookofshaders.com
範例：shadertoy