HTML Code

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

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

    .box {
      display: flex;
      flex-wrap: wrap;
      width: 150px;
      border: 1px solid #94a3b8;
    }

    .box div {
      width: 70px;
      flex: 0 0 70px;
      padding: 8px;
      background: #93c5fd;
      text-align: center;
    }
  </style>
</head>
<body>
  <p>At <strong>150px</strong> wide, only two items fit per line, so wrap creates more rows.</p>
  <div class="box">
    <div>1</div><div>2</div><div>3</div>
    <div>4</div><div>5</div><div>6</div>
  </div>
</body>
</html>

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CSS flex-wrap Property — narrow container