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

    .container {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      max-width: 32rem;
    }

    .item {
      background: #4ade80;
      color: #14532d;
      padding: 1.25rem;
      text-align: center;
      border-radius: 0.35rem;
      font-weight: 600;
    }
  </style>
</head>
<body>
  <h1>Three Equal Columns</h1>
  <div class="container">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
  </div>
</body>
</html>

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CSS grid-template-columns Property - repeat(3, 1fr)