What is a CSS rule?

Module - Web Page Design
Chapter 2 - Working with Web Pages
Activity 1 -  Visual Web Page Editing

In step 7 students are advised to explore changing text styles using CSS in the Properties box. This results in a request for a new CSS rule. This is not explained until the next step (step 8).

Text styles can be adequately investigated by highlighting selected text and using HTML in the properties box.