<html>
	<head>
		<title>Centrage vertical</title>

		<style type="text/css">
div.conteneur {
  height:200px;
  line-height:200px;
  text-align:center; /* centrage horizontal */
}

div.bloc {
  width:100px;
  border:1px solid #fff;
  vertical-align:middle;
  display:inline-block;
  line-height:1.2; /* on rétablit le line-height */
  text-align:left; /* ... et l'alignement du texte */
}
		</style>
	</head>
	<body>
<div class="conteneur">
  <div class="bloc">
    <h3>Kikoo !</h3>

    <p>Lorem ipsum [...]</p>
  </div>
  <span></span>
</div>
	</body>
</html>