<div class="animate pop"></div>
body {
  display: grid;
  height: 100vh;
  place-items: center;
}

div {
  background: #ff7a18;
  height: 250px;
  width: 250px;
}

.animate.pop {
  animation-name: animate-pop;
  animation-timing-function: cubic-bezier(0.26, 0.53, 0.74, 1.48);
  animation-duration: 0.5s;
}

@keyframes animate-pop {
  0% {
    opacity: 0;
    transform: scale(0.5, 0.5);
  }

  100% {
    opacity: 1;
    transform: scale(1, 1);
  }
}
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