Make one HTML page with 10 different light/dark mode toggle switches. Each one is its own idea (a sun turning into a moon, a day sky turning into night, a lamp, a sleeping cat, or anything better you can think of). Each toggle animates when it switches, and the whole page also changes between light and dark. Show them in a grid with a short name under each. So people can see them without clicking, every toggle also flips by itself every 2 seconds until someone clicks it. No images, no external libraries, no network requests. Write it in one go: don't open it in a browser or test it. Just deliver the file.