you can do the Tribute Page on any topic you want
Just be sure to pass all the tests, and know that it will be linked in your certificate, so be sure to be proud of your work!
I’ve seen tribute pages about Pokemon, historical figures, musicals, authors, and food, just to name a few. It doesn’t really matter. It’s all good practice.
You need to use what you learned in that HTML & CSS course for that Tribute Page.
If you’re out of ideas on how the page would look like. Try googling “Tribute Page ideas” and you’ll get plenty of results.
But you have to pass all the tests otherwise you wouldn’t continue to the next project.