Chapter 7 requires some image files, but none were provided; only text files were in the downloaded examples file.
Also, the web page that I am currently entering this information on mistakenly scolded me for using all caps in my title. I only used caps for the acronym CSS yet the message that appears under the box stated, "EASE UP ON THE ALL CAPS IN YOUR TITLE. It looks like you're shouting." Frankly, it appeared that the scolding message was shouting at me for the use of all caps, but I only used the all caps (properly) for the acronym. I think you may have a programmer trying to be cute, but not carefully writing his checking code.