playground/grid.html

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>foo</title>
  <style type="text/css">
    body, html, #mount {
      width: 100%;
      height: 100%;
      margin: 0;
      padding: 0;
    }
    .cell {
      display: flex;
      flex-direction: row;
    }
    .button,
    .input,
    .image {
      width: 100%;
      height: 100%;
    }
    .button {
      appearance: none;
      border: none;
      background-color: #DDD;
      border-radius: 4px;
      display: flex;
      align-content: center;
    }
    .input {
      box-sizing: border-box;
    }
    .image {
      height: auto;
      width: 100%;
    }
  </style>
</head>
<body>
  <div id="mount"></div>

  <script src="utils.js"></script>
  <script src="helper.js"></script>
  <script>
    loadReact();
    loadScriptsAndStyles('grid.js');
  </script>
</body>
</html>