index.web.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>Calculator Web App</title>
  <meta name="description" content="">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
</head>
<body>
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  <div id="content"></div>

  <script>
    __REACT_DEVTOOLS_GLOBAL_HOOK__ = parent.__REACT_DEVTOOLS_GLOBAL_HOOK__
  </script>
  <script type="text/javascript" src="assets/main.js"></script>
</body>
</html>