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<html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>body { padding: 25px; background-color: white; color: black; font-size: 25px;}.dark-mode { background-color: black; color: white;}</style></head><body><h2>Toggle Dark/Light Mode</h2><p>Click the button to toggle between dark and light mode for this page.</p><button onclick="myFunction()">Toggle dark mode</button><script>function myFunction() { var element = document.body; element.classList.toggle("dark-mode");}</script></body></html>