HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Length in px</title>
  <style>
    .frame {
      border: 2px dashed #94a3b8;
      padding: 10px;
    }

    .box {
      width: 200px;
      box-sizing: border-box;
      padding: 0.5rem 0.75rem;
      border-radius: 5px;
      background: rgba(14, 165, 233, 0.15);
      border: 2px solid rgb(14, 165, 233);
      color: #0c4a6e;
      font-family: system-ui, sans-serif;
      text-align: center;
    }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <div class="frame">
    <div class="box">200px</div>
  </div>
</body>
</html>

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CSS Length — Pixels