title: Fix jupyter notebook toolbar with jupyterthemes and table of contents
body: <p>I'm running a jupyter notebook after having changed the theme this way</p>
  
  <pre><code>!jt -t oceans16 -T -N -kl
  </code></pre>
  
  <p>Now the toolbar appears but it overlaps with the code and table of contents. If I scroll down the notebook it keeps hiding the first cells and the table of contents:</p>
  
  <p><a href="https://i.stack.imgur.com/B5PLY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/B5PLY.png" alt="enter image description here"></a></p>
  
  <p>This stops once I revert to default</p>
  
  <pre><code>!jt -r
  </code></pre>
  
  <p>as you can see from here:</p>
  
  <p><a href="https://i.stack.imgur.com/OeJ22.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OeJ22.png" alt="enter image description here"></a></p>
  
  <p>Is it a problem from my settings of <code>jupytherthemes</code> or in the table of content from <code>nbextension</code>?</p>