Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style> 
#myDIV {
    position: absolute;
    width: 100px;
    height: 100px;
    background-color: coral;
    color: white;
    bottom: 0px;
    -webkit-animation: mymove 5s infinite; /* Chrome, Safari, Opera */
    animation: mymove 5s infinite;
}

/* Chrome, Safari, Opera */
@-webkit-keyframes mymove {
    50% {bottom: 300px;}
}

/* Standard syntax */
@keyframes mymove {
    50% {bottom: 300px;}
}
</style>
</head>
<body>

<p>Gradually change the bottom property from 0px from the bottom to 300px then back:<p>
<div id="myDIV">
  <h1>myDIV</h1>
</div>

<p>The bottom property is <em>animatable</em> in CSS.</p>
<p><b>Note:</b> CSS Animations do not work in Internet Explorer 9 and earlier versions.</p>

</body>
</html>