Cascading Style Sheet (CSS) is a style shet
language used for describing the look and
formatting of a document written in a markup
language. It is mostly used to style webpages and
interfaces written in HTML. Like I always say:
HTML is the skeleton while CSS is the flesh, that is,
CSS is used to control the style and layout of
multiple webpages all at once.
How To Use CSS
CSS cab be used in any webpage in three ways:
External Style Sheet
Internal Style Sheet
Inline Styles
External Style Sheet
As the name implies, an external style sheet is a
separate file created and referenced in any
webpage. This file is saved with the .css extension
which indicates its a CSS file. The code snippet
below shows how to use external style sheet.
continue reading: http://tutorialslodge.com/css-beginners/