="#" role="button" aria-haspopup="true" aria-expanded="false">宮沢賢治</a>
              <div class="dropdown-menu">
                <a class="dropdown-item" data-toggle="tab" href="#dropdown1">雨ニモマケズ</a>
                <a class="dropdown-item" data-toggle="tab" href="#dropdown2">春と修羅(序)</a>
                <a class="dropdown-item" data-toggle="tab" href="#dropdown3">銀河鉄道の夜</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item