HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>grid-column-start: auto</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 8px;
    }

    .grid > div {
      padding: 12px;
      background: #dbeafe;
      border: 1px solid #2563eb;
      text-align: center;
    }

    .item {
      grid-column-start: auto;
      background: #fce7f3;
      border-color: #db2777;
    }
  </style>
</head>
<body>
  <p><strong>auto</strong> is the default — the grid places the item in the next free cell.</p>
  <div class="grid">
    <div class="item">Item</div>
    <div>A</div>
    <div>B</div>
  </div>
</body>
</html>

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CSS grid-column-start Property — auto