x
<html>
<head>
<style>
.falling-banner{
position:absolute;
top:100px;
width:250px;
height:150px;
background-color:lightblue;
animation:fallingBanner 1s 1;
animation:fallingBanner 1s 1; /*for safari */
}
</style>
</head>
<body>
<div class="falling-banner">
</div>
</body>
</html>