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<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <title>Basic Donut Chart</title>
  <link rel="stylesheet" href="style.css">
</head>
​
<body>
    <div id="chart" class="chart-container" />
      <script src='https://cdnjs.cloudflare.com/ajax/libs/d3/4.9.1/d3.min.js'></script>
      <script src="https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js"></script>
    <script src="index.js"></script>
</body>
</html>
​
    

Modified http://cdnjs.cloudflare.com/ajax/libs/d3/4.9.1/d3.min.js to a secure url

Modified http://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js to a secure url

https://cdnjs.cloudflare.com/ajax/libs/d3/4.9.1/d3.min.js

https://labratrevenge.com/d3-tip/javascripts/d3.tip.v0.6.3.js