javajam CSS question?

In book ISBN 9780134322759 Book name Web Development & Design Foundation With HTML5

Chapter 12 Page 534 Task 3

?What would the code look like and where in the CSS to place it?

Task 3: Configure the CSS. Laurich a text editor and open javajam.css. a. Add a new style rule to configure a class named clearleft that has a lem margin and will clear a left float. a. Configure a new id named #herocouch with 250px height that displays the hero- couch.jpg image in 100% of the background. Use the #heroguitar id as a guide as you code the styles