HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS Grid Basic Example</title>
  <style>
    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 0.75rem;
      padding: 1rem;
      background: #f1f5f9;
      border-radius: 0.5rem;
    }

    .cell {
      padding: 1rem;
      background: #2563eb;
      color: #fff;
      border-radius: 0.35rem;
      text-align: center;
      font-family: system-ui, sans-serif;
      font-size: 0.875rem;
    }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <h1 style="font-size:1.125rem;color:#1e293b;">Basic 3-Column Grid</h1>
  <div class="grid">
    <div class="cell">1</div>
    <div class="cell">2</div>
    <div class="cell">3</div>
    <div class="cell">4</div>
    <div class="cell">5</div>
    <div class="cell">6</div>
  </div>
</body>
</html>

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CSS Grid — Basic 3-Column Layout