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 left Fixed Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      min-height: 120vh;
    }

    .sidebar {
      position: fixed;
      left: 1rem;
      top: 1rem;
      width: 10rem;
      padding: 1rem;
      background: #1e293b;
      color: #fff;
      border-radius: 0.5rem;
      font-weight: 600;
    }

    main {
      margin-left: 12rem;
    }
  </style>
</head>
<body>
  <aside class="sidebar">Fixed sidebar</aside>
  <main>
    <h1>Fixed Sidebar Panel</h1>
    <p>Scroll the page — the sidebar stays anchored to the left edge of the viewport.</p>
  </main>
</body>
</html>

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CSS left Property - fixed sidebar