Corrected typo
Added subpage about puppies
Ran html and css validation and corrected errors

Things I've learned:
* Always add a meta charset tag when opening local files directly in the browser.
* CSS only has block comments, not single line comments.
* ul inside ul is not allowed, but ul inside li is ok.

There is one additional error I can't figure out. It seems the
validator is seeing a superfluous closing p tag, but playing around
with this makes it seem to me that the validator is making a mistake.