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HTML

              
                div.infinite-slider
  div.items
   each val in [1, 2, 3, 4, 5, 6, 7, 8, 9]
    div(class='item item-' + val)
              
            
!

CSS

              
                @keyframes moveSlideshow
  100% {transform: translateX(-66.6666%)}

.infinite-slider
  height 250px
  max-width 1200px
  margin 0 auto
  position relative
  overflow hidden
  transform translate3d(0, 0, 0)
  @media screen and (max-width: 780px)
    height 150px
  
  .items
    display flex
    width 300%
    height 100%
    animation moveSlideshow 20s linear infinite
    
    .item
      width 400px
      height 100%
      top 0
      left 0
      background-position center center
      background-size cover

    .item-1
      background-image url(https://picsum.photos/400/300?image=101)
    .item-2
      background-image url(https://picsum.photos/400/300?image=102)
    .item-3
      background-image url(https://picsum.photos/400/300?image=103)
    .item-4
      background-image url(https://picsum.photos/400/300?image=104)
    .item-5
      background-image url(https://picsum.photos/400/300?image=106)
    .item-6
      background-image url(https://picsum.photos/400/300?image=107)
    .item-7
      background-image url(https://picsum.photos/400/300?image=101)
    .item-8
      background-image url(https://picsum.photos/400/300?image=102)
    .item-9
      background-image url(https://picsum.photos/400/300?image=103)


              
            
!

JS

              
                
              
            
!
999px

Console