HTML Code

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

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

    div {
      width: 200px;
      height: 100px;
      background: #2563eb;
      border: 2px solid #1e3a8a;
      border-top-right-radius: 0;
      color: #fff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
    }
  </style>
</head>
<body>
  <p><strong>border-top-right-radius: 0</strong> is the initial value. The top-right corner stays square.</p>
  <div>Square</div>
</body>
</html>

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CSS border-top-right-radius Property — 0