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

    .demo {
      display: grid;
      gap: 2rem;
      max-width: 28rem;
    }

    .grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      grid-auto-rows: 80px;
      gap: 10px;
    }

    .grid > div {
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 0.35rem;
      font-weight: 600;
    }

    .normal {
      grid-auto-flow: row;
    }

    .normal > div {
      background: #fecaca;
      color: #991b1b;
    }

    .dense {
      grid-auto-flow: row dense;
    }

    .dense > div {
      background: #bbf7d0;
      color: #166534;
    }

    .wide {
      grid-column: span 2;
    }

    .label {
      margin: 0 0 0.5rem;
      font-size: 0.875rem;
      font-weight: 600;
      color: #64748b;
    }
  </style>
</head>
<body>
  <h1>row vs row dense</h1>
  <div class="demo">
    <div>
      <p class="label">grid-auto-flow: row</p>
      <div class="grid normal">
        <div class="wide">Wide</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
      </div>
    </div>
    <div>
      <p class="label">grid-auto-flow: row dense</p>
      <div class="grid dense">
        <div class="wide">Wide</div>
        <div>2</div>
        <div>3</div>
        <div>4</div>
      </div>
    </div>
  </div>
</body>
</html>

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CSS grid-auto-flow Property - row dense