<button id="mapButton" class="switch-button active" onclick="showSection('map')">橋梁マップ</button>
          <button id="recentReportsButton" class="switch-button" onclick="showSection('recent-reports')">投稿マップ</button>
          <button id="recentPostsButton" class="switch-button" onclick="showSection('recent-posts')">最新の投稿</button>