HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS Grid Responsive Example</title>
  <style>
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      gap: 0.75rem;
      padding: 1rem;
      background: #f8fafc;
      border-radius: 0.5rem;
    }

    .card {
      padding: 1rem;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 0.4rem;
      text-align: center;
      font-family: system-ui, sans-serif;
      font-size: 0.875rem;
      color: #334155;
    }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <h1 style="font-size:1.125rem;color:#1e293b;">Responsive Grid</h1>
  <p style="font-size:0.9375rem;color:#64748b;margin:0 0 1rem;">Resize the preview — columns reflow automatically.</p>
  <div class="grid">
    <div class="card">Card 1</div>
    <div class="card">Card 2</div>
    <div class="card">Card 3</div>
    <div class="card">Card 4</div>
  </div>
</body>
</html>

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CSS Grid — Responsive auto-fit Grid