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 flex-direction - Responsive Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .cards {
      display: flex;
      flex-direction: row;
      gap: 1rem;
    }

    .card {
      flex: 1;
      padding: 1.25rem;
      background: #e0e7ff;
      border-radius: 0.5rem;
      text-align: center;
    }

    @media (max-width: 600px) {
      .cards {
        flex-direction: column;
      }
    }
  </style>
</head>
<body>
  <h1>Responsive Flex Direction</h1>
  <p>Resize the window: row on wide screens, column below 600px.</p>
  <div class="cards">
    <div class="card">Card A</div>
    <div class="card">Card B</div>
    <div class="card">Card C</div>
  </div>
</body>
</html>

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CSS flex-direction Property - Responsive Layout