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

    .container {
      display: grid;
      grid-template-columns: 100px 1fr 200px;
      gap: 10px;
      max-width: 36rem;
    }

    .item {
      background-color: #ddd;
      padding: 20px;
      text-align: center;
      border-radius: 0.35rem;
      font-weight: 600;
    }

    .item:nth-child(2) {
      background-color: #93c5fd;
      color: #1e3a5f;
    }
  </style>
</head>
<body>
  <h1>Grid Template Columns Example</h1>
  <div class="container">
    <div class="item">Item 1</div>
    <div class="item">Item 2</div>
    <div class="item">Item 3</div>
  </div>
</body>
</html>

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CSS grid-template-columns Property - 100px 1fr 200px