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

    .grid-container {
      display: grid;
      grid-template-rows: 100px 100px 100px;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 10px;
      max-width: 28rem;
    }

    .grid-item {
      background-color: #ff5733;
      color: white;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 0.35rem;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <h1>Simple Grid Layout</h1>
  <div class="grid-container">
    <div class="grid-item">1</div>
    <div class="grid-item">2</div>
    <div class="grid-item">3</div>
    <div class="grid-item">4</div>
    <div class="grid-item">5</div>
    <div class="grid-item">6</div>
    <div class="grid-item">7</div>
    <div class="grid-item">8</div>
    <div class="grid-item">9</div>
  </div>
</body>
</html>

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CSS grid Property - Simple 3×3 Grid Layout