A CSS document (a style
sheet) consists of a set of style
rules
A CSS document (a style
sheet) consists of a set of style
rules. Each style rule starts with a selector and is
followed by a declaration block enclosed by curly braces.
The selector defines a pattern, and the declarations are applied
to the objects that match the pattern.
The basic example below shows how to apply
the color red to all emphasis elements in the HTML document.
em { color : red ; }
where
em
is the selector, and “
color : red ;
” is a declaration.
It is possible to group several rules with
the same declarations. Use a comma “,” to separate the selectors.
For example:
em, b { color : red ; }