title: Background colors matplotlib
body: <p>I made this picture with matplotlib. I would like to split the background in two slightly colorfull side with two legends in each of them "mu &lt; mu_{0}" for the left and "\mu > \mu_{0}$ for the right.</p>
  
  <p>Do you know how to do that ?</p>
  
  <p>THanks and regards.</p>
  
  <p><a href="https://i.stack.imgur.com/NrvDR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NrvDR.png" alt="enter image description here"></a></p>