Try it Editor: The animation-duration Property

Edit This Code :

<!DOCTYPE html>
<html>
<head>
<style> 
div {
    width: 100px;
    height: 100px;
    background: red;
    position: relative;
    -webkit-animation: mymove infinite; /* Safari 4.0 - 8.0 */
    -webkit-animation-duration: 3s; /* Safari 4.0 - 8.0 */
    animation: mymove infinite;
    animation-duration: 3s;
}

/* Safari 4.0 - 8.0 */
@-webkit-keyframes mymove {
    from {top: 0px;}
    to {top: 200px;}
}

@keyframes mymove {
    from {top: 0px;}
    to {top: 200px;}
}
</style>
</head>
<body>

<h1>The animation-duration Property</h1>

<p>Specify that the animation should complete one cycle in 3 seconds:</p>

<div></div>

<p><strong>Note:</strong> Always specify the animation-duration property. Otherwise the duration is 0, and the animation will not be played.</p>
<p><strong>Note:</strong> The animation-duration property is not supported in Internet Explorer 9 and earlier versions.</p>

</body>
</html>
Result :