Adding and Formatting Text - New Perspectives on Adobe Dreamweaver CS5, Comprehensive - page 130

SESSION 3.2 VISUAL OVERVIEW
An alternate way to
create a new style is to
select New from the
CSS Styles list in the
Format menu.
A Cascading Style
Sheet (CSS) is a
collection of styles that
is either inserted in the
head of the HTML of a
Web page and used
throughout that page
(an internal style sheet),
or is attached as an
external document and
used throughout the
entire Web site (an
external style sheet).
When you create a
Class style, you must
select the content, to
which the style will be
applied, then you must
select the style from
the Class list.