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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <style>
    .container {
      display: grid;
      grid-gap: 5px;
      grid-template: auto / 1fr 3fr 1fr;
      background: lightyellow;
    }
    .subgrid {
      display: grid;
      grid: subgrid / subgrid;
    }
    header, aside, section, footer {
      background: lightblue;
      font-family: sans-serif;
      font-size: 3em;
    }
    header, footer {
      grid-column: span 3;
    }
    main {
      grid-column: span 3;
    }
    .aside1 {
      grid-column: 1;
    }
    .aside2 {
      grid-column: 3;
    }
    section {
      grid-column: 2;
    }
  </style>
</head>
<body>
  <div class="container">
    <header class="subgrid">Header</header>
    <main class="subgrid">
      <aside class="aside1 subgrid">aside</aside>
      <section>section</section>
      <aside class="aside2 subgrid">aside2</aside>
    </main>
    <footer>footer</footer>
  </div>
</body>
</html>