HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>padding-block-start: 5%</title>
  <style>
    .wrap {
      width: 280px;
      border: 1px dashed #94a3b8;
    }

    .box {
      padding-block-start: 5%;
      border: 2px solid #334155;
      background: #fde68a;
    }
  </style>
</head>
<body>
  <div class="wrap">
    <div class="box">5% block-start padding</div>
  </div>
</body>
</html>

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CSS padding-block-start Property — percentage