index.html
<!DOCTYPE html>
<html>
<head>
<title>D3 map drag demo</title>
<link rel="stylesheet" href="styles.css">
<script src="https://unpkg.com/d3@5.6.0/dist/d3.min.js"></script>
<script src="https://unpkg.com/topojson@3.0.2/dist/topojson.min.js"></script>
</head>
<body>
<svg width="960" height="500"></svg>
<script src="bundle.js"></script>
</body>
</html>
