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<body>
  <div id="root"></div>
  
  <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
  <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
  <script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
  <script type="text/babel">
    const { useRef, useEffect } = React;

const CustomCard = ({ title, children }) => {
      const cardRef = useRef(null);

useEffect(() => {
        if (cardRef.current) {
          const shadowRoot = cardRef.current.attachShadow({ mode: 'open' });

shadowRoot.innerHTML = `
            <style>
              .card {
                padding: 10px;
                border: 1px solid #ddd;
                border-radius: 5px;
                box-shadow: 0 2px 5px rgba(0,0,0,0.2);
              }
              .card-title {
                font-size: 1.2em;
                margin-bottom: 5px;
              }
            </style>
            <div class="card">
              <div class="card-title">${title}</div>
              <div class="card-content">${children}</div>
            </div>
          `;
        }
      }, [title, children]);

return <div ref={cardRef}></div>;
    };

const App = () => (
      <CustomCard title="Hello World">
        This is content inside the shadow DOM.
      </CustomCard>
    );

const rootElement = document.getElementById('root');
    const root = ReactDOM.createRoot(rootElement);
    root.render(<App />);
  </script>
</body>