3-responsive-layouts/flex">Flex system (flexbox)</a></li>
          <li><a href="/codebase-4/docs/3-responsive-layouts/flex-pseudo-grids">Flex pseudo grids</a></li>
          <li><a href="/codebase-4/docs/3-responsive-layouts/grid">Real grid system</a></li>
        </ul>

        <div class="mt-1 p-block t-loose t-uppercase t-small">Utilities</div>

        
        <div x-data="{ revealed: false }">
        
          <button
            class="block b-0 unrounded p-1"
            @click="revealed = !revea