HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>grid-column-gap: percentage</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;
      grid-column-gap: 10%;
      max-width: 30rem;
    }

    .grid > div {
      padding: 12px;
      background: #dbeafe;
      border: 1px solid #2563eb;
      text-align: center;
    }
  </style>
</head>
<body>
  <p><strong>grid-column-gap: 10%</strong> is relative to the grid content width.</p>
  <div class="grid">
    <div>1</div><div>2</div><div>3</div>
  </div>
</body>
</html>

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CSS grid-column-gap Property — percentage