public/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Michael MacKenzie</title>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;500;700;900&display=swap" rel="stylesheet">
    <link
      rel="stylesheet"
      href="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
      integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh"
      crossorigin="anonymous"
    />

    <script src="https://unpkg.com/react/umd/react.production.min.js" crossorigin></script>

    <script
      src="https://unpkg.com/react-dom/umd/react-dom.production.min.js"
      crossorigin>
    </script>

    <script
      src="https://unpkg.com/react-bootstrap@next/dist/react-bootstrap.min.js"
      crossorigin>
    </script>

    <script>var Alert = ReactBootstrap.Alert;</script>
  </head>

  <body>
    <div id="root"></div>
    <script src="../src/index.js" type="text/jsx"></script>
  </body>
</html>