CSS is a style language that defines layout of HTML documents. For example, CSS covers fonts, colors, margins, lines, height, width, background images, advanced positions and many other things.

HTML can be used to add layout to a websites. But CSS offers more options. It is supported by all browsers by using browser specific code.

By using practical implementation of few tutorials you will be able to make your own style sheets using CSS to give your website a new great look. That means CSS provides a user oriented look and feel.

Which benefits will CSS have?

CSS was a revolution in the world of web design. The concrete benefits of CSS include:

• Control layout of many documents from one single style sheet.
• More precise control of layout.
• Apply different layout to different media-types (screen, print, etc.);
• Numerous advanced and sophisticated techniques.

Generally there are three ways to use CSS:

•  Inline CSS 
•  Internal CSS
• External CSS

CSS3 is the latest version and usually in use. 

CSS3 Modules

CSS3 has been split into "modules". It contains the "old CSS specification" (which has been split into smaller pieces).

Some of the most important CSS3 modules are:

• Understanding of Classes and ID’s
• Selectors
• Box Model
• Backgrounds and Borders
• Image Values and Replaced Content
• Text Effects
• 2D/3D Transformations
• Animations
• Multiple Column Layout
• User Interface