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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS grid-column Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .grid-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 10px;
      max-width: 36rem;
    }

    .grid-container > div {
      background-color: lightblue;
      padding: 1rem;
      text-align: center;
      border-radius: 0.35rem;
    }

    .item1 {
      grid-column: 1 / 3;
      background-color: #93c5fd !important;
    }

    .item2 {
      grid-column: 3 / 5;
    }

    .item3 {
      grid-column: span 2;
    }
  </style>
</head>
<body>
  <h1>Grid Layout with Custom Column Spans</h1>
  <div class="grid-container">
    <div class="item1">Item 1</div>
    <div class="item2">Item 2</div>
    <div class="item3">Item 3</div>
    <div class="item4">Item 4</div>
  </div>
</body>
</html>

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CSS grid-column Property - Line Numbers and Span