Please include following css file at head element

                                    
                                                        <!-- Datatables css -->
                                                        <link href="assets/vendor/datatables.net-bs5/css/dataTables.bootstrap5.min.css" rel="stylesheet" type="text/css" />
                                                        <link href="assets/vendor/datatables.net-responsive-bs5/css/responsive.bootstrap5.min.css" rel="stylesheet" type="text/css" />
                                                    
                                                

Make sure to include following js files at end of body element

                                    
                                                        <!-- Datatables js -->
                                                        <script src="assets/vendor/datatables.net/js/jquery.dataTables.min.js"></script>
                                                        <script src="assets/vendor/datatables.net-bs5/js/dataTables.bootstrap5.min.js"></script>
                                                        <script src="assets/vendor/datatables.net-responsive/js/dataTables.responsive.min.js"></script>
                                                        <script src="assets/vendor/datatables.net-responsive-bs5/js/responsive.bootstrap5.min.js"></script>

                                                        <!-- Datatable Init js -->
                                                        <script src="assets/js/pages/demo.datatable-init.js"></script>
                                                    
                                                

                                    
                                                        <table id="basic-datatable" class="table dt-responsive nowrap w-100">
                                                            <thead>
                                                                <tr>
                                                                    <th>Name</th>
                                                                    <th>Position</th>
                                                                    <th>Office</th>
                                                                    <th>Age</th>
                                                                    <th>Start date</th>
                                                                    <th>Salary</th>
                                                                </tr>
                                                            </thead>


                                                            <tbody>
                                                                <tr>
                                                                    <td>Tiger Nixon</td>
                                                                    <td>System Architect</td>
                                                                    <td>Edinburgh</td>
                                                                    <td>61</td>
                                                                    <td>2011/04/25</td>
                                                                    <td>$320,800</td>
                                                                </tr>
                                                                <tr>
                                                                    <td>Garrett Winters</td>
                                                                    <td>Accountant</td>
                                                                    <td>Tokyo</td>
                                                                    <td>63</td>
                                                                    <td>2011/07/25</td>
                                                                    <td>$170,750</td>
                                                                </tr>
                                                            </tbody>
                                                        </table>