【align】
<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
div {
display: table-cell;
vertical-align: middle;
border: 1px dotted gray;
height: 200px;
}
</style>
</head>
<body>
<div>
<p>First paragraph.</p>
<p>Second paragraph.</p>
</div>
</body>
</html>
