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  h1 Swipe left or right! ✋


  --bg #2ecc71
  --translate 0

  box-sizing border-box

  background-color var(--bg)
  margin 0
  padding 0

  color #fafafa
  display flex
  justify-content center
  align-items center
  height 100vh
  position absolute
  transform translateX(calc(var(--translate) * 1px))
  text-align       center
  width 100vw
  transition background .25s



                const root = document.documentElement
const body = document.body
const header = document.querySelector('h1')
const swipeLimit = 50

let startX
const endTouch = (e) => {'--bg', 'limegreen')
  const finishingTouch = e.changedTouches[0].clientX
  if (startX < (finishingTouch - swipeLimit)) {
    header.textContent = 'Swiped Right ➡️'
  } else if (startX > (finishingTouch + swipeLimit)) {
    header.textContent = 'Swiped Left ⬅️'
  }'--translate', 0)
  body.removeEventListener('touchmove', moveTouch)
  body.removeEventListener('touchend', endTouch)
const moveTouch = (e) => {'--bg', 'dodgerblue')
  const progressX = startX - e.touches[0].clientX
  const translation = progressX > 0 ? parseInt(-Math.abs(progressX)) : parseInt(Math.abs(progressX))'--translate', translation)
const startTouch = (e) => {
  const {
  } = e
  if (touches && touches.length === 1) {
    const touch = touches[0]
    startX = touch.clientX'--bg', '#e74c3c')
    body.addEventListener('touchmove', moveTouch)
    body.addEventListener('touchend', endTouch)

body.addEventListener('touchstart', startTouch)