html - 使用引导程序居中缩略图

Question

我正在尝试将一组流体缩略图居中，但它们总是左对齐而不是居中。

这是显示问题的jsfiddle：

http://jsfiddle.net/4040newb/bVa2Z/3/

您可能需要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>