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CSS stands for Cascading Style Sheets  Styles define how to display HTML elements  Styles were added to HTML 4.0 to solve a problem  External Style Sheets can save a lot of work  External Style Sheets are stored in CSS files Styles Solved a Big Problem  HTML was never intended to contain tags for formatting a document.  HTML was intended to define the content of a document, like:  <h1>This is a heading</h1>  <p>This is a paragraph.</p>  When tags like <font>, and color attributes were added to the HTML 3.2 specification, it started a nightmare for web developers. Development of large web sites, where fonts and color information were added to every single page, became a long and expensive process.  To solve this problem, the World Wide Web Consortium (W3C) created CSS.  In HTML 4.0, all formatting could be removed from the HTML document, and stored in a separate CSS file.  All browsers support CSS today. CSS Saves a Lot of Work!  CSS defines HOW HTML elements are to be displayed.  Styles are normally saved in external .css files. External style sheets enable you to change the appearance and layout of all the pages in a Web site, just by editing one single file! CSS Syntax  A CSS rule has two main parts: a selector, and one or more declarations: 
 The selector is normally the HTML element you want to style.  Each declaration consists of a property and a value.  The property is the style attribute you want to change. Each property has a value.
CSS Selectors  Three types of CSS Selectors  Element  Class  ID