index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
    <script src="https://d3js.org/d3.v4.min.js" type="text/javascript"></script>
    <title>Title</title>
</head>
<body>

</body>
<link rel="stylesheet" type="text/css" href="css/style.css">
<script src="js/color.js" type="text/javascript"></script>
<script src="js/data.js" type="text/javascript"></script>
<script src="js/drawVis.js" type="text/javascript"></script>
</html>