- const COUNT = 10
- let b = 0
while b < COUNT
  .box= b + 1
  - b++

*
  box-sizing border-box
  
body
  display grid
  place-items center
  min-height 100vh
  background hsl(0, 0%, 10%)
  
.box
  position absolute
  top 50%
  left 50%
  height 25vmin
  width 25vmin
  display grid
  place-items center
  font-size 5vmin
  font-family sans-serif
  transform translate(-50%, -50%)
  
  &:nth-of-type(odd)
    background hsl(90, 80%, 70%)
  
  &:nth-of-type(even)
    background hsl(90, 80%, 40%)

import gsap from 'https://cdn.skypack.dev/gsap'

const BOXES = gsap.utils.toArray('.box')
const stagger = 0.5

const getShift = () => gsap.fromTo(BOXES, {
  xPercent: 100
}, {
  xPercent: -200,
  stagger,
  duration: 1,
  ease: 'none',
})

const LOOP = gsap.timeline({
  repeat: -1
})
  .add(getShift(), 0)
  .add(getShift(), BOXES.length * stagger)
  .add(getShift(), BOXES.length * stagger * 2)