The text for this class HMTL & CSS: Design and Build Websites, by Jon Duckett, can be accessed free of charge through the Sherrod Library e-books archive
Once you land on the home page, click the "RESEARCH" link in the upper right of the page
On the left, click the "Books & eBooks" link
Scroll down to the "O'Reilly for Higher Education eBooks (formerly Safari Books)" link and click it
You'll be prompted to login with your ETSU credentials
Close any pop-ups that appear on the page. Enter "HTML & CSS" in the search bar. Your text should be the first in the resulting list
Click the link, then "Continue." That will take you to the text. Navigating the book itself can be accomplished via the right panel. The application will keep track of your progress through the book.
Enjoy!