软件名居中显示

<div style="position:absolute;left:430px;top:3px">
    <span style="font-size:250%;color:white">XXXXXXX装配线</span>
</div>

<div style="position:absolute;top: 50%;left: 50%;margin-top:-18px;margin-left:-220px">
    <ul class="nav navbar-nav pull-left">
        <li>
           <span style="font-size:250%;color:white">XXXXXXX装配线</span>
        </li>
    </ul>
</div>