<html>
<head>
<style>
div
{
width:350px;
height:100px;
border:1px solid black;
/* Internet Explorer 10 */
display:-ms-flexbox;
-ms-flex-pack:center;
-ms-flex-align:center;
/* Firefox */
display:-moz-box;
-moz-box-pack:center;
-moz-box-align:center;
/* Safari, Chrome, and Opera */
display:-webkit-box;
-webkit-box-pack:center;
-webkit-box-align:center;
/* W3C */
display:box;
box-pack:center;
box-align:center;
}
</style>
</head>
<body>
<div>
<p>Center me!</p>
</div>
<p><b>Note:</b> Flexible boxes are not supported in IE 9, and earlier versions.</p>
</body>
</html>