HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Flexbox Column Example</title>
  <style>
    .stack {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      max-width: 220px;
      padding: 1rem;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
    }

    .stack a {
      padding: 0.65rem 0.85rem;
      background: #fff;
      color: #334155;
      text-decoration: none;
      border-radius: 0.35rem;
      border: 1px solid #e2e8f0;
      font-family: system-ui, sans-serif;
      font-size: 0.9375rem;
    }

    .stack a:hover {
      background: #eff6ff;
      color: #2563eb;
    }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <h1 style="font-size:1.125rem;color:#1e293b;">Column Stack</h1>
  <nav class="stack">
    <a href="#">Home</a>
    <a href="#">About</a>
    <a href="#">Contact</a>
  </nav>
</body>
</html>

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CSS Flexbox — Column Direction