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              <div class="clock">
  <div class="hours">
    <div class="first">
      <div class="number">0</div>
    </div>
    <div class="second">
      <div class="number">0</div>
    </div>
  </div>
  <div class="tick">:</div>
  <div class="minutes">
    <div class="first">
      <div class="number">0</div>
    </div>
    <div class="second">
      <div class="number">0</div>
    </div>
  </div>
  <div class="tick">:</div>
  <div class="seconds">
    <div class="first">
      <div class="number">0</div>
    </div>
    <div class="second infinite">
      <div class="number">0</div>
    </div>
  </div>
</div>
            
          
!
            
              * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  width: 100%;
}

body {
  background: black;
  display: flex;
  justify-content: center;
  align-items: center;
}

.clock {
  height: 20vh;
  color: white;
  font-size: 22vh;
  font-family: sans-serif;
  line-height: 20.4vh;
  display: flex;
  position: relative;
  /*background: green;*/
  overflow: hidden;
}

.clock::before, .clock::after {
  content: '';
  width: 7ch;
  height: 3vh;
  background: linear-gradient(to top, transparent, black);
  position: absolute;
  z-index: 2;
}

.clock::after {
  bottom: 0;
  background: linear-gradient(to bottom, transparent, black);
}

.clock > div {
  display: flex;
}

.tick {
  line-height: 17vh;
}

.tick-hidden {
  opacity: 0;
}

.move {
  animation: move linear 1s infinite;
}

@keyframes move {
  from {
    transform: translateY(0vh);
  }
  to {
    transform: translateY(-20vh);
  }
}


            
          
!
            
              var hoursContainer = document.querySelector('.hours')
var minutesContainer = document.querySelector('.minutes')
var secondsContainer = document.querySelector('.seconds')
var tickElements = Array.from(document.querySelectorAll('.tick'))

var last = new Date(0)
last.setUTCHours(-1)

var tickState = true

function updateTime () {
  var now = new Date
  
  var lastHours = last.getHours().toString()
  var nowHours = now.getHours().toString()
  if (lastHours !== nowHours) {
    updateContainer(hoursContainer, nowHours)
  }
  
  var lastMinutes = last.getMinutes().toString()
  var nowMinutes = now.getMinutes().toString()
  if (lastMinutes !== nowMinutes) {
    updateContainer(minutesContainer, nowMinutes)
  }
  
  var lastSeconds = last.getSeconds().toString()
  var nowSeconds = now.getSeconds().toString()
  if (lastSeconds !== nowSeconds) {
    //tick()
    updateContainer(secondsContainer, nowSeconds)
  }
  
  last = now
}

function tick () {
  tickElements.forEach(t => t.classList.toggle('tick-hidden'))
}

function updateContainer (container, newTime) {
  var time = newTime.split('')
  
  if (time.length === 1) {
    time.unshift('0')
  }
  
  
  var first = container.firstElementChild
  if (first.lastElementChild.textContent !== time[0]) {
    updateNumber(first, time[0])
  }
  
  var last = container.lastElementChild
  if (last.lastElementChild.textContent !== time[1]) {
    updateNumber(last, time[1])
  }
}

function updateNumber (element, number) {
  //element.lastElementChild.textContent = number
  var second = element.lastElementChild.cloneNode(true)
  second.textContent = number
  
  element.appendChild(second)
  element.classList.add('move')

  setTimeout(function () {
    element.classList.remove('move')
  }, 990)
  setTimeout(function () {
    element.removeChild(element.firstElementChild)
  }, 990)
}

setInterval(updateTime, 100)
            
          
!
999px
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