text: var u = document.querySelector('#el')
  u.style.backgroundColor = "red"
  u.style.width = u.style.height = '20' + 'px'
  var cont = document.querySelector('#cont')
  var mainb = document.querySelector('#main')
  mainb.style.display = 'none'
  var c = 1 
  var f = true
  var a = 0
  var interval = setInterval(async ()=>{
    if(f){
      u.style.width = c + 'px'
      c++
      u.style.color = 'red'
    if(c == 400){
      f = false
      a++
    }
    }
    if(!f){
      u.style.width = c + 'px'
      c--
      if(c == 0){
        f = true
        a++
      }
    }
    if(a == 2){
      clearInterval(interval)
      u.style.color = "white"
      u.style.backgroundColor = 'blue'
      u.style.marginLeft = '150px'
      setTimeout(()=>{
        cont.style.display = 'none'
        mainb.style.display = 'block'
      })
      }
    }
  )
  