Vertically centering block elements with CSS.

Via phrogz.net.

<style type="text/css">
    #wrapper { position:relative; } /* position:absolute is also ok */
    #wrapped { position:absolute; top:50%; height:10em; margin-top:-5em; }  /* margin-top = -1 * height/2 */
</style>
...
<div id="wrapper">
    <div id="wrapped">
        <p>Block content.</p>
        <p>But still vertically centered.</p>
    </div>
</div>