<html>
  <head>
    <script type="module" src="https://unpkg.com/@material/mwc-button?module"></script>
    <style>
      body {
        background: #ccc;
        display: flex;
        align-items: center;
        justify-content: center;
      }
    </style>
  </head>
  <body>
    <mwc-button>Hello World</mwc-button>
  </body>
</html>
