<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{margin: 0;padding: 0}
.box{width:800px;height:100px;background:#ccc;text-align: center}
.box p {margin:0;padding:0;display: inline-block;vertical-align: middle;text-align: left}
#liu_area{display: inline-block;height:100%;vertical-align: middle;}
#p_span{display: block}
</style>
</head>
<body>
<div class="box">
<p>
<span id="p_span">第一行</span>
<span id="p_span">第二行</span>
</p>
<span id="liu_area"></span>
</div>
</body>
</html>
效果图如下：
