<button id="mapButton" class="switch-button active" onclick="showSection('map')">橋梁マップ</button>
          <button id="recentPostsButton" class="switch-button" onclick="showSection('recent-posts')">最新の投稿</button>
          <button id="topUsersButton" class="switch-button" onclick="showSection('top-users')">ME-TOP3</button>
          <button id="nearestBridgesButton" class="switch-button" onclick="showSection('nearest-bridges')">最寄りの橋梁</button>