Thumbnail to <iframe> expand

<!DOCTYPE html>
  <head>
    <meta charset="utf-8">
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <style>
      body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
      html {
        box-sizing: border-box;
      }
      *, *:before, *:after {
        box-sizing: inherit;
      }
      .container {
        width: 230px;
        height: 120px;
        transition: width 0.3s, height 0.3s;
      }
      .container:hover {
        width: 1280px;
        height: 500px;      
      }
      .container:hover .iframe-wrapper {
        width: 960px;
      }      
      .iframe-wrapper {
        position: relative;
        height: 100%;
      }
      iframe {
        position: absolute;
        border-width: 0;
        /* 230 * (1/.23)*/
        width: 1000px;
        /* 120 * (1/.23)*/
        height: 522px;
        transform: scale(0.23);
        transition: transform 0.3s;
        /* Make sure we are fixed to top left corner */
        transform-origin: 0 0;
      }
      .description-container {
        background-color: pink;
        width: 0;
        position: absolute;
        height: 120px;
        top: 0;
        left: 0;
        opacity: 0;
        transition: height 3s;
      }
      .container:hover .description-container {
        transition-delay: 0.4s;
        transition-property: left, opacity;
        transition-duration: 0.4s;
        opacity: 1;
        width: 320px;
        height: 500px;
        left: 960px;
      }      
      .container:hover iframe {
        width: 100%;
        height: 100%;
        transform: scale(1);
      }
      .container iframe,
      .container .description-container {
        opacity: 0;
      }
      .container:hover iframe,
      .container:hover .description-container {
        opacity: 1;
      }
      .container:hover .thumbnail {
        display: none;
      }    
      .thumbnail {
        position: absolute;
        background-color: rgb(243, 243, 243); 
        height: 120px;
        display: inline-block;
        width: 230px;
      }
    </style>
  </head>

<body>
    <div class="container">
      <a class="thumbnail" href="https://bl.ocks.org/jonsadka/3bddce9b5f6b167fffbb" target="_blank" style="background-image: url(&quot;https://gist.githubusercontent.com/jonsadka/3bddce9b5f6b167fffbb/raw/08eb6477ca0f12a8f43104042863a815a40502ec/thumbnail.png&quot;);"></a>  
      <div class="description-container">
        Details
      </div>
      <div class="iframe-wrapper">
        <iframe sandbox='allow-popups allow-scripts allow-forms allow-same-origin' src="https://cdn.rawgit.com/jonsadka/3bddce9b5f6b167fffbb/raw/9b2139f4aa475397284cc98b535c9f3de2bddda6/index.html" margin-width='0' margin-height='0' scrolling='no'></iframe>
      </div>
    </div>
    <p style="padding: 5px;">
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Errem omittantur nam cu, ut postea putant fastidii sea, velit discere duo an. Porro regione et pri, veri rebum verterem vis ex. Sit alii laoreet ea, possit causae sit et, omnis justo ne nec. Ne nisl nullam ubique quo, facilis appetere ne quo, reprimique efficiendi cu nec. In integre legimus mandamus quo. Magna singulis ut cum, in dicta nusquam elaboraret sea.
    </p>
  </body>

https://d3js.org/d3.v4.min.js