<!-- This one does work in safari & ios and other modern browsers -->
<div class="wrap">
  <ol class="hundreds">
    <li>1</li>
    <li>0</li>
  </ol>
  <ol class="tens">
    <li>0</li>
    <li>9</li>
    <li>8</li>
    <li>7</li>
    <li>6</li>
    <li>5</li>
    <li>4</li>
    <li>3</li>
    <li>2</li>
    <li>1</li>
    <li>0</li>
  </ol>
  <ol class="units">
    <li>0</li>
    <li>9</li>
    <li>8</li>
    <li>7</li>
    <li>6</li>
    <li>5</li>
    <li>4</li>
    <li>3</li>
    <li>2</li>
    <li>1</li>
    <li>0</li>
  </ol>
</div>

html,
body,
ol {
  margin: 0;
  padding: 0;
}
ol {
  list-style: none;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
body:before {
  content: "";
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  z-index: -1;
  background: linear-gradient(red, red);
  background-size: 100% 0;
  background-repeat: no-repeat;
  animation: bg 5s linear forwards;
}
.wrap {
  text-align: center;
  border: 5px solid #000;
  font-size: 4rem;
  box-shadow: 0 0 20px 20px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  width: 145px;
  height: 35px;
  line-height: 35px;
  padding: 0 10px;
  position: relative;
  border: 5px solid #000;
  background: #eee;
  display: flex;
  justify-content: center;
  background: linear-gradient(#ccc, #eee);
  mix-blend-mode: luminosity;
}
.wrap ol {
  font-family: monospace;
  font-size: 35px;
  font-weight: bold;
  line-height: 1;
  margin: 0 2px;
  transform: translateY(0%);
}
@keyframes bg {
  100% {
    background-size: 100% 100%;
  }
}

.wrap ol {
  line-height: 35px;
}
.wrap li {
  height: 35px;
}
ol.units {
  animation: units 0.5s steps(100) forwards;
  animation-iteration-count: 10;
}
ol.tens {
  animation: tens 5s steps(10) forwards;
  animation-iteration-count: 1;
}
ol.hundreds {
  animation: hundreds 5s steps(1) forwards;
  animation-iteration-count: 1;
}

@keyframes units {
  0% {
    transform: translateY(-1000%);
  }
  100% {
    transform: translateY(0%);
  }
}
@keyframes tens {
  0% {
    transform: translateY(-1000%);
  }
  100% {
    transform: translateY(0%);
  }
}
@keyframes hundreds {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(0%);
  }
}