title: Positioning a div
body: <p>Was wondering would anyone be able to help, I'm trying to position a div but it doesn't seem to be moving at all. Here is the code : </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.gallery-photos clearfix {
    position: absolute;
    top: 50%;
    left: 50%;
    margin-top: -50px;
    margin-left: -50px;
  }
  .gallery-photos {
    padding: 20px;
  }
  .gallery-photos .big-photo {
    display: block;
    background-color: #ffffff;
    padding: 3px;
    border: 1px solid #e7e7e7;
    margin-right: 210px;
  }
  .gallery-photos .big-photo img {
    display: block;
    max-width: 100%;
    height: auto;
    margin: 0 auto;
  }
  .gallery-photos .photo-thumbnails {
    float: right;
    width: 210px;
  }
  .gallery-photos .photo-thumbnails .thumbnail {
    float: left;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
    width: 30%;
    height: 63px;
    cursor: pointer;
    padding: 3px;
    border: 1px solid #e7e7e7;
    margin-left: 3.33333%;
    margin-bottom: 6px;
    opacity: 0.4;
  }
  .gallery-photos .photo-thumbnails .thumbnail.current {
    opacity: 1;
    background-color: #ffffff;
  }
  .gallery-photos .photo-thumbnails .thumbnail .thumbnail-inner {
    height: 100%;
    overflow: hidden;
  }
  .gallery-photos .photo-thumbnails .thumbnail img {
    display: block;
    width: auto;
    max-height: 100%;
    margin: 0 auto;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="gallery-photos clearfix"&gt;
    &lt;div class="photo-thumbnails"&gt;
      &lt;div class="thumbnail current"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/1.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/2.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/3.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/4.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/5.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/6.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/1.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/2.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
      &lt;div class="thumbnail"&gt;
        &lt;div class="thumbnail-inner"&gt;
          &lt;img src="images/3.jpg" alt="" /&gt;
        &lt;/div&gt;
      &lt;/div&gt;
    &lt;/div&gt;
    &lt;div id="big-photo" class="big-photo"&gt;
      &lt;img src="images/1.jpg" alt="" /&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
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  </p>