title: Flickity carousel image doesn't show
body: <p>I have a Flickity carousel where everythign is set and working, except that it obnly shows the last of the pictures I have and it repeat it over the others (as if it's on top of them).
  I don't understand why.</p>
  
  <p>This is my HTML:</p>
  
  <pre><code>&lt;div class="main-carousel" data-flickity='{ "cellAlign": "left", "contain": true }'&gt;
     &lt;div class="carousel-cell"&gt;
       &lt;img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/orange-tree.jpg" /&gt;
     &lt;/div&gt;
     &lt;div class="carousel-cell"&gt;
       &lt;img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/submerged.jpg" /&gt;
     &lt;/div&gt;
     &lt;div class="carousel-cell"&gt;
       &lt;img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/look-out.jpg" /&gt;
     &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>And CSS:</p>
  
  <pre><code>.main-carousel {
    width: 90%;
    align-items: center;
    margin-top: 1%;
    margin-left: 5%;
    height: 420px;
  }
  
  .carousel-cell {
    width: 100%; /* full width */
    padding-left: 10px;
    height: 400px;
    background: #fff;
    /* center images in cells with flexbox */
    display: flex;
    align-items: center;
    justify-content: center;
   }
  
   .carousel-cell img {
    display: block;
    max-height: 100%;
   }
  </code></pre>
  
  <p>Thank you very much for your help!</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.main-carousel {
    width: 90%;
    align-items: center;
    margin-top: 1%;
    margin-left: 5%;
    height: 420px;
  }
  
  .carousel-cell {
    width: 100%; /* full width */
    padding-left: 10px;
    height: 400px;
    background: #fff;
    /* center images in cells with flexbox */
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .carousel-cell img {
    display: block;
    max-height: 100%;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://unpkg.com/flickity@2/dist/flickity.pkgd.min.js"&gt;&lt;/script&gt;
  &lt;link href="https://unpkg.com/flickity@2/dist/flickity.min.css" rel="stylesheet"/&gt;
  &lt;div class="main-carousel" data-flickity='{ "cellAlign": "left", "contain": true }'&gt;
                        &lt;div class="carousel-cell"&gt;
                          &lt;img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/orange-tree.jpg" /&gt;
                        &lt;/div&gt;
                        &lt;div class="carousel-cell"&gt;
                          &lt;img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/submerged.jpg" /&gt;
                        &lt;/div&gt;
                        &lt;div class="carousel-cell"&gt;
                          &lt;img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/look-out.jpg" /&gt;
                        &lt;/div&gt;
                      &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Thank you very much for your help!</p>