text: 
  const hello = document.getElementById('hello')
  const hi = document.getElementById('hi')
  let left1 = 0
  let left2 = 0
  
  const myAnimation = (milliseconds, callback) => {
      setTimeout(callback, milliseconds)
  }
  
  const step = () => {
      if (left1 < 1000) {
          left1 += 10
      } else {
          left1 = 0
      }
      hello.style.left = left1 + 'px'
      requestAnimationFrame(step)
  }
  
  
  const step2 = () => {
      if (left2 < 1000) {
          left2 += 10
      } else {
          left2 = 0
      }
      hi.style.left = left2 + 'px'
      myAnimation(16.67, step2)
  }
  
  step()
  
  step2()