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 Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .rounded-box {
      width: 200px;
      height: 100px;
      background: lightblue;
      border-radius: 15px;
    }
  </style>
</head>
<body>
  <h1>Box with Rounded Corners</h1>
  <div class="rounded-box"></div>
</body>
</html>

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CSS border-radius Property - 15px Rounded Box