-3HS6YOU4">not required</u>. Also <code class="astro-3HS6YOU4">.app-heading</code> and <code class="astro-3HS6YOU4">.app-footer</code> elements can be used
                    <u class="astro-3HS6YOU4">multiple</u>. But <code class="astro-3HS6YOU4">.app-container</code> is
                    <u class="astro-3HS6YOU4">required</u> and must be used
                    <u class="astro-3HS6YOU4">single</u>.
                  </p>

                  <h4 class="astro-3HS6YOU4">Example : 3 rows</h4>
             