message: Fixing layouts example for CodeSandbox
diff: </style>
  <div id="sigma-container"></div>
  <div id="buttons">
  - <button id="random"><span><img src="./public/GiPerspectiveDiceSixFaces.svg"/>random</span></button>
  + <button id="random"><span><img src="./GiPerspectiveDiceSixFaces.svg"/>random</span></button>
  <button id="forceatlas2">
  <span >
  - <img id="forceatlas2-start-label" src="./public/BiPlay.svg"/>
  - <img id="forceatlas2-stop-label" style="display: none" src="./public/BiPause.svg"/>
  + <img id="forceatlas2-start-label" src="./BiPlay.svg"/>
  + <img id="forceatlas2-stop-label" style="display: none" src="./BiPause.svg"/>
  Force Atlas 2
  </span>
  </button>
  - <button id="circular"><span><img src="./public/BiLoaderCircle.svg"/>circular</span></button>
  + <button id="circular"><span><img src="./BiLoaderCircle.svg"/>circular</span></button>
  </div>
  <script src="build/bundle.js"></script>
  </body>
  