JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html lang="en">

  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/5.0.0-alpha1/css/bootstrap.min.css">
  </head>

  <body>

    <div class="container mt-5">

      <!-- button to initialize toast -->
      <button type="button" class="btn btn-primary" id="toastbtn">Initialize toast</button>

      <!-- Toast -->
      <div class="toast">
        <div class="toast-header">
          <strong class="mr-auto">Bootstrap</strong>
          <small>11 mins ago</small>
          <button type="button" class="ml-2 mb-1 close" data-dismiss="toast">
            <span>&times;</span>
          </button>
        </div>
        <div class="toast-body">
          Hello, world! This is a toast message.
        </div>
      </div>

    </div>


    <!-- Popper.js first, then Bootstrap JS -->
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/5.0.0-alpha1/js/bootstrap.min.js"></script>
    <script>
      document.getElementById("toastbtn").onclick = function() {
        var toastElList = [].slice.call(document.querySelectorAll('.toast'))
        var toastList = toastElList.map(function(toastEl) {
          return new bootstrap.Toast(toastEl, option)
        })
      };

    </script>
  </body>

</html>