6YOU4">multiple</u>. But <code class="astro-3HS6YOU4">.side-content</code> is required and should be used
                        <u class="astro-3HS6YOU4">single</u>.
                      </p>
                      <p class="astro-3HS6YOU4">
                        <code class="astro-3HS6YOU4">.app-side</code> is based on <a href="http://getbootstrap.com/examples/sticky-footer/" target="_blank" class="astro-3HS6YOU4">sticky footer</a>.
                        <code class="astro-3HS6YOU4">.side-content</co