.container
  // 雪碧圖(總寬度 2880px,共 8 幀)
  img(src="https://i.imgur.com/5aXROc2.png", alt="")
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.container
  width: 360px    // 總寬度 2880px / 8幀
  overflow: hidden
  animation: moveContainer 5s infinite linear
  
img
  margin-top: 80px
  animation: run 0.5s infinite steps(8)   // 8 幀
  
@keyframes run
  0%
    transform: translateX(0px)
  100%
    transform: translateX(-2880px)   // 總寬度 2880px

// 移動 container,製造出「往前跑」的效果
@keyframes moveContainer
  0%
    transform: translateX(0px)
  100%
    transform: translateX(1600px)
  
  
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