设置文字居中显示的三句代码

.middle-box{display: table; height: 300px; border:1px solid #ff0000; width:400px; margin:0 auto; position:relative;}
.middle-inner{display: table-cell; vertical-align:middle; *position:absolute; *top:50%; *left:50%; width:100%; text-align:center;}  //用了css的hack，对ie6,ie7的兼容

.middle-inner p{position:relative; *top:-50%; *left:-50%;}

<div class="middle-box">
<div class="middle-inner">
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</div>
</div>