title: Customizing colorbar border color on matplotlib
body: <p>how can I change the colorbar borders so that they are white and not black (externals border and between each segment)?</p>
  
  <p>For example:</p>
  
  <pre><code>x=randint(100, size=(10,10))
  cs=contourf(x)
  cb=colorbar(cs)
  </code></pre>
  
  <p>give </p>
  
  <p><img src="https://i.stack.imgur.com/KVS7g.jpg" alt="enter image description here"></p>
  
  <p>but I want :</p>
  
  <p><img src="https://i.stack.imgur.com/aMfjp.jpg" alt="enter image description here"></p>
  
  <p>Thanks</p>