HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS grid-row Sidebar Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .layout {
      display: grid;
      grid-template-columns: 5rem 1fr 1fr;
      grid-template-rows: repeat(2, 100px);
      gap: 10px;
      max-width: 32rem;
    }

    .layout > div {
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 0.35rem;
      font-weight: 600;
    }

    .sidebar {
      grid-column: 1;
      grid-row: 1 / -1;
      background: #fecaca;
      color: #991b1b;
    }

    .cell {
      background: #bfdbfe;
      color: #1e3a5f;
    }
  </style>
</head>
<body>
  <h1>Full-Height Sidebar</h1>
  <div class="layout">
    <aside class="sidebar">Nav</aside>
    <div class="cell">A</div>
    <div class="cell">B</div>
    <div class="cell">C</div>
    <div class="cell">D</div>
  </div>
</body>
</html>

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CSS grid-row Property - Full-Height Sidebar