SOURCE

<div class="box">
	<div class="sub">
		<h1>标题</h1>
		<p>居中</p>
	</div>
</div>

* {font-size: 14px;}
.box{
	background: #fff; text-align: center; line-height: 0; vertical-align: middle; width: 300px; height: 300px; display: table-cell;
	.sub{
		background: #ffcc00; line-height: normal; width: 120px; height: 120px; max-width: 120px; display: inline-block;
		h1{width: 100%; max-width: inherit; position: fixed;}
	}
}