custom background color Chart.js

HTML

<script src="Chart.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.3.0/Chart.bundle.min.js"></script>
<div style="width: 500px;height: 300px">
  <canvas id="mychart"></canvas>
</div>

JavaScript

(function() {
  var ctx = document.getElementById("mychart");

  var datas = {
    labels: ['Passed', 'Failed', 'In Progress'],
    datasets: [{
      label: 'Data',
      data: [0, 5, 80],
      backgroundColor: [
        "green",
        "red",
        "yellow"
      ],
    }, ]
  };

  

   
  var chr = new Chart(ctx, {
    data: datas,
    type: 'pie'
  });

})();