HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :empty Basic Example</title>
  <style>
    :empty {
      border: 2px dashed #ef4444;
      background-color: #fef2f2;
      min-height: 3rem;
    }

    .container p {
      padding: 0.65rem;
      background-color: #ecfdf5;
      border-radius: 0.35rem;
    }

    .container {
      max-width: 28rem;
      font-family: system-ui, sans-serif;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>Empty vs Filled</h1>
    <p>This paragraph has content.</p>
    <p></p>
    <div class="box"></div>
  </div>
</body>
</html>

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CSS :empty Selector - Basic Highlight