               <div class="input-group">
                                    <input type="text" class="form-control" placeholder="Search for a book...">
                                    <span class="input-group-btn">
                                        <button class="btn btn-default" type="button">Go!</button>
                                    </span>
                                </div>
                            </div>
                        </div>
                    </div>
                 