CSS Animation
アニメーション
animation
animation-name
animation-duration
animation-timing-function
animation-delay
animation-iteration-count
animation-direction
animation-fill-mode
animation-play-state
https://qiita.com/soarflat/items/4a302e0cafa21477707f#css-animationを利用したアニメーションを実装してみる
filter: blur() contrast()
https://speakerdeck.com/yusukemx5/cssanimesiyonfalsekuang-qi?slide=17
CSS: clip-path