title: How to reset 'plt.style.use('dark_background')'?
body: <pre><code>plt.style.use('dark_background')
  </code></pre>
  
  <p>I put this into my jupyter notebook and now all of my graphs have a black background. How do I change it back to the default of white background? If I remove the code from the jupyter notebook the graphs still all have a black background. </p>