<body>
<style>

div {
  width: 100px;
  height: 100px;
  margin-bottom: 2rem;
  border: 10px solid green;
  background-color: green;
}

</style>
<script>

document.body.appendChild(document.createElement("div")).animate({ transform: "scale(0)" }, 1000 * 60 * 60 * 24);

</script>
</body>