title: Preserve dataframe style when exporting notebook
body: <p>How can I preserve the DataFrame style which I see in the Jupyter Notebook when I export the notebook to HTML?</p>
  
  <p>I convert it like this:</p>
  
  <pre><code>jupyter nbconvert --to html &lt;name&gt;.ipynb
  </code></pre>
  
  <p>When I have converted it I only get an "ugly" DataFrame grid, and not the nice formatting as I see in the notebook.</p>