設定DIV中的select水準垂直居中

<div style="position: relative">
    <select class="select" style="text-align: center;text-align-last: center;">
        <option name="areaId" value="1">測試</option>
     </select>
</div>      

<div style="position: relative">
    <select class="select" style="margin: auto; position: absolute;top: 0;left: 0;bottom: 0;right: 0;">
        <option name="areaId" value="1">測試</option>
     </select>
</div>