<html>
<head>
<style>
#div1 {
position: relative;
box-sizing: border-box;
margin: auto;
height: 150px;
width: 200px;
padding: 10px;
border: 1px solid black;
}
#div2 {
padding: 40px;
box-sizing: border-box;
position: absolute;
border: 1px solid black;
background-color: red;
aspect-ratio: 5/2;
}
</style>
</head>
<body>
<h1>The aspect-ratio Property</h1>
<div id="div1">DIV1
<div id="div2">DIV2</div>
</div>
</body>
</html>