CSS-animation-duration

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HTML

<div class="scaleme">
</div>

CSS

.scaleme {
  width: 200px;
  height: 200px;
  background: #ff8a65;
}

@keyframes scaleme {
  0% {
    transform: scale(0.1);
    opacity: 0;
  }
  60% {
    transform: scale(0.5);
    opacity: 1;
  }
  100% {
    transform: scale(1);
  }
}

.scaleme {

}