HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>aspect-ratio: 1 / 1 and 16 / 9</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

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

    .row {
      display: flex;
      flex-wrap: wrap;
      align-items: flex-start;
      gap: 12px;
    }

    .label {
      margin: 0 0 8px;
      font-weight: 700;
    }

    .box {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 160px;
      background: #1d4ed8;
      color: #fff;
      font-weight: 700;
    }

    .wide { background: #0f766e; }
    .square { aspect-ratio: 1 / 1; }
    .wide { aspect-ratio: 16 / 9; }
  </style>
</head>
<body>
  <p>Both boxes are 160px wide. Height is automatic. <strong>1 / 1</strong> is a square. <strong>16 / 9</strong> is width times 9 / 16 tall.</p>
  <div class="row">
    <div>
      <p class="label">aspect-ratio: 1 / 1</p>
      <div class="box square">1 / 1</div>
    </div>
    <div>
      <p class="label">aspect-ratio: 16 / 9</p>
      <div class="box wide">16 / 9</div>
    </div>
  </div>
</body>
</html>

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CSS aspect-ratio Property — square and 16 / 9