"using html and css" "programming class"
nah but in all seriousness just make it about something you enjoy and it'll come out a lot nicer. Someone suggested a zarp wiki. I think that's a solid idea if you find a topic you're knowledgeable about even if it isn't zarp. And if it's only html and css without any fancy applications, the only thing you really can do is some sort of text/image based website.