HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :only-child Hover Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      max-width: 22rem;
    }

    .box {
      padding: 0.85rem 1rem;
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
    }

    p:only-child {
      margin: 0;
      padding: 0.65rem 0.9rem;
      font-size: 0.9375rem;
      color: #334155;
      border-radius: 0.4rem;
      transition: background 0.2s ease;
      cursor: default;
    }

    p:only-child:hover {
      background: #fef3c7;
    }
  </style>
</head>
<body>
  <h1>Hover me</h1>
  <div class="box">
    <p>Hover over this solo paragraph.</p>
  </div>
</body>
</html>

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CSS :only-child - Hover on Solo Paragraph