<span>在<div>内垂直、水平居中

<div style="width: 130px;height: 40px;
         display: table-cell;/*1必填*/
         vertical-align: middle;/*2必填*/
         text-align: center;/*3必填*/
         border: black 1px solid;">
    <span style="font-size: 13px;">Test</span>
</div>