title: Change background color of label Chart.js
body: <p>I'm trying to change the background color of labels in a Polar Chart. I want to change the background color to black.</p>
  
  <p>I'm using the global variable to change the font color:</p>
  
  <pre><code>Chart.defaults.global.defaultFontColor = 'rgba(255, 255, 255, 0.7)';
  </code></pre>
  
  <p>This is the chart that is shown.</p>
  
  <p><a href="https://i.stack.imgur.com/vdhxU.png" rel="nofollow noreferrer">Chart Printscreen</a></p>
  
  <pre><code>new Chart(ctx, {
      data: data = {
          datasets: [{
              data: [25, 10, 20],
              backgroundColor: [
                  'yellow',
                  'blue',
                  'red',
              ],
              borderColor: [
                  'yellow',
                  'blue',
                  'red',
              ],
          }],
          labels: [
              'Yellow',
               'Blue',
               'Red',
          ]
      },
      type: 'polarArea',
  });
  </code></pre>
  
  <p>Thanks for the attention!</p>