CSS Animatable box-shadow Property Example

<!DOCTYPE html>
<html>
<head>
<style> 
#container1, #container2 {
  	display: flex;
  	justify-content: center;
    align-items: center;
    color: #fff;
    font-size: 20px;
    font-weight: bold;
	width: 120px;
	height: 100px;
    margin: auto;
}
#container1 {
    background: #f00;
    animation: anim1 5s infinite;
}
#container2 {
    background: #00f;
    animation: anim2 5s infinite;
    margin-top: 20px;
}

@keyframes anim1 {
	50% {box-shadow: 0 0 30px 10px #0f0;}
}
@keyframes anim2 {
	50% {box-shadow: 10px 10px 30px 5px #f00;}
}
</style>
</head>
<body>

<h1>Animatable 'box-shadow' Property</h1>
<hr>

<p>Experience the changing size, color, and position of the shadow of the container using box-shadow property.<p>
<div id="container1">Container 1</div>
<div id="container2">Container 2</div>

</body>
</html>