HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS order Responsive Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 2rem;
    }
    .layout {
      display: flex;
      flex-direction: column;
      gap: 1rem;
      max-width: 360px;
    }
    .panel {
      padding: 1rem;
      border-radius: 0.65rem;
      font-weight: 600;
    }
    .sidebar {
      order: 2;
      background: #fef3c7;
      border: 1px solid #fcd34d;
    }
    .main {
      order: 1;
      background: #ecfdf5;
      border: 1px solid #86efac;
    }
    @media (min-width: 768px) {
      .layout {
        flex-direction: row;
      }
      .sidebar,
      .main {
        order: 0;
        flex: 1;
      }
    }
  </style>
</head>
<body>
  <h1>Responsive Sidebar Order</h1>
  <div class="layout">
    <aside class="panel sidebar">Sidebar</aside>
    <main class="panel main">Main content</main>
  </div>
</body>
</html>

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CSS order Property - Responsive Sidebar