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

    .container {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      grid-auto-rows: 100px;
      gap: 10px;
      margin-bottom: 1.5rem;
      max-width: 36rem;
    }

    .item {
      background-color: lightblue;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 1.5rem;
      border-radius: 0.35rem;
    }

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

    .column {
      grid-auto-flow: column;
      grid-template-rows: repeat(2, 100px);
    }

    .column .item {
      background-color: #bbf7d0;
    }
  </style>
</head>
<body>
  <h1>Grid with grid-auto-flow Property</h1>

  <h2>Auto Flow: Row (Default)</h2>
  <div class="container row">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
  </div>

  <h2>Auto Flow: Column</h2>
  <div class="container column">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
  </div>
</body>
</html>

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CSS grid-auto-flow Property - Row vs Column