すごいCSSの作品
Front-end dev reacts to amazing CSS-only Codepens | YouTube
静物画のやつ（
https://codepen.io/ivorjetski/pen/xMJoYO
）
振り子のやつがすごい
Pure CSS 3D Animated Jellyfish | Codepen
Awesome CSS Border Animation | Quick CSS3 Animation Effects | YouTube