It’s a good idea to add comments to your CSS to note the primary sections of your style sheets or simply to explain something about a particular rule or declaration. Comments help not only you but also others who are viewing your code. For your own sake, you’ll be happy that you left yourself comments if you revisit the code some months after having initially worked on it.
1. In your style sheet, type /* to begin your comment.
2. Type the comment.
3. Type */ to signal the end of the comment.
Comments may include returns and thus span several lines .