<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>