I uploaded all my study document previously and was wonder if someone can look over my style sheet (.css) file to see what kind of errors I have.

I uploaded all my study document previously and was wonder if someone can look over my style sheet (.css) file to see what kind of errors I have. I am on chapter 8 of my Web Design with HTML & CSS3 book.

Here is the book if needed: https://my.pcloud.com/publink/show?code=XZr2Ae7ZBJ9FetWqNNSL4dpSAIIAfjnhlxu7