header">

          <!-- top toolbar -->
          <app-toolbar>
            <!-- menu button -->
            <paper-icon-button
                drawer-toggle
                icon="app:menu"
                hidden$="[[_shouldHideMenuButton(pageData.page, narrow)]]"></paper-icon-button>

            <!-- back button -->
            <a
                href="#/[[categoryData.category]]/list"
                hidden$="[[_equal(pageData.page, 'list')]]">
              <paper-icon-button icon="app:arrow-back"></pa