<html>
  <head>
    <title>Sample App</title>
    <style>
      body {
        font-family:
          SF UI Text,
          Roboto,
          Helvetica Neue,
          Helvetica,
          sans-serif;
        font-size: 18px;
        line-height: 1.5;
      }
    </style>
  </head>
  <body>
    <div id="root"></div>
  </body>
</html>