zig Tryit Editor

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="../../cdn.jsdelivr.net/npm/bootstrap%404.6.2/dist/css/bootstrap.min.css">
  <script src="../../cdn.jsdelivr.net/npm/jquery%403.7.1/dist/jquery.slim.min.js"></script>
  <script src="../../cdn.jsdelivr.net/npm/popper.js%401.16.1/dist/umd/popper.min.js"></script>
  <script src="../../cdn.jsdelivr.net/npm/bootstrap%404.6.2/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Badge inside a Button</h2>
  <button type="button" class="btn btn-primary">
    Messages <span class="badge badge-light">4</span>
  </button>
  <button type="button" class="btn btn-danger">
    Notifications <span class="badge badge-light">7</span>
  </button>
</div>

</body>

</html>