 value="AX">Articles</option>
                                    <option value="AF">Authors</option>
                                    <option value="AF">Tags</option>
                                </select>
                                <input type="text" class="form-control" placeholder="Type your key words and hit enter">
                                <div class="input-group-append">
                                    <button class="btn btn-black" type="submit">
                                