Код IT Загрузка примера кода…

HTML main.html 
<!DOCTYPE html>
<html lang="ru">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Каркас Grid</title>
  <style>
    *, *::before, *::after { box-sizing: border-box; }
    body {
      margin: 0;
      min-height: 100dvh;
      display: grid;
      grid-template-columns: 12rem 1fr;
      grid-template-rows: auto 1fr auto;
      grid-template-areas:
        "header header"
        "nav    main"
        "footer footer";
      font-family: system-ui, sans-serif;
    }
    header { grid-area: header; padding: 1rem 1.25rem; background: #313244; color: #cdd6f4; }
    nav {
      grid-area: nav;
      padding: 1rem;
      background: #45475a;
      color: #bac2de;
    }
    nav a { display: block; color: inherit; text-decoration: none; margin-bottom: 0.5rem; }
    main { grid-area: main; padding: 1.25rem; }
    footer {
      grid-area: footer;
      padding: 0.75rem 1.25rem;
      background: #1e1e2e;
      color: #a6adc8;
      font-size: 0.9rem;
    }
    @media (max-width: 48rem) {
      body {
        grid-template-columns: 1fr;
        grid-template-areas:
          "header"
          "nav"
          "main"
          "footer";
      }
      nav { display: flex; gap: 1rem; flex-wrap: wrap; }
      nav a { margin: 0; }
    }
  </style>
</head>
<body>
  <header><strong>Панель</strong></header>
  <nav>
    <a href="#">Раздел 1</a>
    <a href="#">Раздел 2</a>
    <a href="#">Раздел 3</a>
  </nav>
  <main>
    <h1>Контент</h1>
    <p>Сетка из именованных областей <code>grid-template-areas</code>.</p>
  </main>
  <footer>Подвал</footer>
</body>
</html>
<!DOCTYPE html>
<html lang="ru">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Каркас Grid</title>
  <style>
    *, *::before, *::after { box-sizing: border-box; }
    body {
      margin: 0;
      min-height: 100dvh;
      display: grid;
      grid-template-columns: 12rem 1fr;
      grid-template-rows: auto 1fr auto;
      grid-template-areas:
        "header header"
        "nav    main"
        "footer footer";
      font-family: system-ui, sans-serif;
    }
    header { grid-area: header; padding: 1rem 1.25rem; background: #313244; color: #cdd6f4; }
    nav {
      grid-area: nav;
      padding: 1rem;
      background: #45475a;
      color: #bac2de;
    }
    nav a { display: block; color: inherit; text-decoration: none; margin-bottom: 0.5rem; }
    main { grid-area: main; padding: 1.25rem; }
    footer {
      grid-area: footer;
      padding: 0.75rem 1.25rem;
      background: #1e1e2e;
      color: #a6adc8;
      font-size: 0.9rem;
    }
    @media (max-width: 48rem) {
      body {
        grid-template-columns: 1fr;
        grid-template-areas:
          "header"
          "nav"
          "main"
          "footer";
      }
      nav { display: flex; gap: 1rem; flex-wrap: wrap; }
      nav a { margin: 0; }
    }
  </style>
</head>
<body>
  <header><strong>Панель</strong></header>
  <nav>
    <a href="#">Раздел 1</a>
    <a href="#">Раздел 2</a>
    <a href="#">Раздел 3</a>
  </nav>
  <main>
    <h1>Контент</h1>
    <p>Сетка из именованных областей <code>grid-template-areas</code>.</p>
  </main>
  <footer>Подвал</footer>
</body>
</html>