Html 使用引导将缩略图居中

我试图将一组流体缩略图居中，但它们总是向左对齐，而不是居中对齐

下面是显示问题的JSFIDLE：

您可能必须放大输出窗口才能并排查看缩略图并观察问题

 <div class="container-fluid">

  <div class="row-fluid">

        <ul class="thumbnails">

    <li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>

<li>
    <a href="photos for nothing.jpg" rel="prettyPhoto[gallery1]" title="nothing">
      <img class="thumbnail" src="blank photos/blankthumb.jpg" alt="nothing">
    </a>
    </li>


</ul>
</div>
</div>

意思是你只是复制粘贴它？您知道需要在参考资料中调用twitterbootstrap框架吗？是的，我没有包括调用框架，因为这是假设的。这只是html的主体，显然我尝试了复制和粘贴，但没有成功。我的问题是，我应该向代码中添加什么才能使其正确。您是否加载了可能存在冲突的任何其他CSS文件？好的，我让JSFIDLE正常工作，这说明了我的缩略图居中问题