<nav class="p01_side">
  <ul class="p01_nav">
    <li class="p01_nLi">
      <a class="p01_nLink" href="#jump01">東北地方</a>
      <div class="p01_navChildwrap"><!-- flex-flow: columnで並べているコンテナを囲む要素 -->
        <ul class="p01_navChild">
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_01">流氷焼</a></li>
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_02">小久慈焼</a></li>
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_03">堤焼</a></li>
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_04">楢岡焼</a></li>
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_05">平清水焼</a></li>
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_06">会津本郷焼</a></li>
          <li class="p01_nCLi"><a class="p01_nCLink" href="#jump01_07">大堀相馬焼</a></li>
        </ul>
      </div>
    </li>
    <!-- 以下略 -->
  </ul>
</nav>