CSS3.com

WHAT IS CSS

Cascading Style Sheets (CSS) are the modern standard for website presentation. When combined with structural markup language like HTML, XHTML, or XML (though not limited to these), CSS provide Internet browsers with the information that enables them to present all the  visual aspects and elements of a web document. CSS apply things like borders, spacing between paragraphs, margins, headings on images, control of font faces or colors, background colors and images, textual effects like underlined or strike-through text, layering, positioning, and a number of other presentational effects. CSS controls the presentational aspects of a web page’s design, whereas HTML, XHTML, or XML control the
 structure of a webpage, which means more than determining that certain text is a heading, other text is a paragraph, other text os a list of hyperlinks, and so on.

 By using modern standards like CSS and XHTML, you can dramatically reduce the cost of building and maintaining a website when compared to legacy HTML-only pages. You can also greatly reduce the amount of physical bandwidth and hard disk space required, resulting in immediate long-term benefits for any webmasters and web visitor

CSS TUTORIAL

 Cascading Style Sheets, commonly referred to as CSS, is a simple design language intended to simplify the process of making web pages presentable. Put simply, CSS handles the look and feel part of a web page or a whole website. With CSS, you can control the color of the text, the style of fonts, the spacing between paragraphs, how columns are sized and laid out, what background images or colors are used, as well as a variery of other effects and styles explained here.

The term cascading in Cascading Style Sheets refers to a specific way in which browsers determine which styles to apply to a specific part of the page. This method is called “the cascade”, and it’s from the cascade that CSS takes its name.