I Uploaded All My Study Document Previously And Was Wonder If Someone Can Look O

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
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