title: How can I change the colour of a slider after its creation?
body: <p>I would like to change the slider cooler from red to blue in the example below. I tried the <code>set_facecolor</code> method but it does not work</p>
  <pre><code>import matplotlib.pyplot as plt
  from matplotlib.widgets import Slider
  
  fig = plt.figure()
  ax = fig.add_axes([0.6, 0.2, 0.25, 0.03])
  slider = Slider(ax, 'Slider', 0,  1, facecolor='r')
  slider.ax.set_facecolor('b')
  plt.show()
  </code></pre>