CSS properties affect how elements are displayed
CSS
declarations sit inside curly brackets and each is made up of two parts: a
property and a value, separated by a colon. You can specify several properties
in one declaration, each separated by a semi-colon.
This rule
indicates hat all <h1> , <h2> and <h3> elements should be
shown in the Arial typeface, in a yellow color.
Properties
indicate the aspects of the element you want to change. For example, color, front,
width, height and border.
Value:
Specify the
settings you want to use for the chosen properties. For example, if you want to
specify a color property then the value is the color you want the text in this
element to be.
