de> will fill the gap in <code class="astro-3HS6YOU4">.app-side</code>.
                      </p>
                      <pre class="astro-3HS6YOU4"><code class="astro-3HS6YOU4">&lt;aside class=&quot;app-side&quot;&gt;
  &lt;header class=&quot;side-heading&quot;&gt;
    ... (not required, can be multiple)
  &lt;/header&gt;
  &lt;div class=&quot;side-content&quot;&gt;
    ... (required, must be single)
  &lt;/div&gt;
  &lt;footer class=&quot;side-footer&quot;&gt;
    ... (not required, can be multiple)
  &lt