それを自分で試してみてください - JavaScript Reference style

<!DOCTYPE html>
<html>
<head>
<style>
#div1 {
    position: relative;
    margin: auto;
    height: 150px;
    width: 250px;
    padding: 10px;
    border: 1px solid black;
    -webkit-perspective: 125px; /* Chrome, Safari, Opera */
    perspective: 125px;
}

#div2 {
    padding: 50px;
    position: absolute;
    border: 1px solid black;
    background-color: coral;
    -webkit-transform: rotateX(45deg); /* Chrome, Safari, Opera */
    transform: rotateX(45deg);
}
</style>
</head>
<body>

<p>Click the "Try it" button to change the perspecive-origin property of the DIV1 element:</p>

<div id="div1">DIV1
  <div id="div2">Think that you are a bird, looking down on a wall. Then click the button to see what happens if the wall moves to the left!</div>
</div>

</body>
</html>