<aside>aside</aside>
<div>
  <header>header</header>
  <main>
    <article>article</article>
    <aside>aside 2</aside>
  </main>
  <footer>footer</footer>
</div>

header, aside, article, footer {
  padding: 50px;
  border: 1px solid;
}

body, main {
  display: flex;
}