15</option>
                                <option value=20>20</option>
                                <option value=25>25</option>
                            </select>
                        </div>
                        <div class="form-group">
                            <div class="panel panel-default">
                                <div class="panel-heading">
                                    <h4 class="panel-title">Visible fields</h4>
                                </div>
         