index.html

<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>Work Schedule Optimization</title>
    <meta name="viewport" content="initial-scale=1.0">
    <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
    <link href="https://use.fontawesome.com/releases/v5.0.6/css/all.css" rel="stylesheet">
    <link rel="shortcut icon" href="favicon.ico">
  </head>
  <body>
      <script type="text/javascript" src="jquery-3.3.1.min.js"></script>
      <script type="text/javascript" src="jquery.firefly-0.7.min.js"></script>
      <script type="text/javascript">
        $(document).ready(function() {
          $.firefly({
            minPixel: 4,
            maxPixel: 8,
            total : 30,
            zIndex: 1,
          });
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      </script>    
    <div id="root"></div>
    <script src="./main.js"></script>
  </body>
</html>