Cascading Style Sheets (CSS) are a collection of formatting
rules which control the appearance of content in a web page.
With CSS styles you have great flexibility and control of the
exact page appearance, from precise positioning of layout to
specific fonts and styles.
CSS styles let you control many properties that cannot be
controlled using HTML alone. For example, you can assign
custom list bullets and specify different font sizes and units
(pixels, points, and so on). By using CSS styles and setting
font sizes in pixels, you can ensure a more consistent
treatment of your page layout and appearance
A CSS style rule consists of two parts—the selector and the
declaration. The selector is the name of the style (such as TR,
or P) and the declaration defines what the style elements are.
The declaration consists of two parts, the property (such as
font-family), and value (such as Helvetica). The term
cascading refers to your ability to apply multiple style
sheets to the same web page.
