message: Moving style tag of example from head to body
  This is because codesandbox seems to "behead" my html
diff: <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Sigma Minimalist Example</title>
  + </head>
  + <body>
  <style>
  html,
  body,
  overflow: hidden;
  }
  </style>
  - </head>
  - <body>
  <div id="sigma-container"></div>
  <script src="build/bundle.js"></script>
  </body>
  