HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS border-radius Four Corners Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .diagonal-corners {
      width: 180px;
      height: 80px;
      background: #fef3c7;
      border: 2px solid #f59e0b;
      border-radius: 12px 0 12px 0;
    }
  </style>
</head>
<body>
  <h1>Four Corner Values</h1>
  <div class="diagonal-corners"></div>
</body>
</html>

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CSS border-radius Property - Four Corner Values