Style or CSS (Cascading Style Sheets, Cascading Style Sheets) is a set of formatting options, which is applied to the elements of the document, to change their appearance. Color, size, position, and other parameters are stored in a particular place and easily "screwed" to any element. Styles are a convenient, practical and effective tool in vorstke web pages and text formatting, tables, links, images and so on. When you use styles we have "clean» HTML code, which only determines the structure of the document and a set of elements, and the design of web pages and the elements themselves is assigned to the CSS.

With styles, you can also determine the design for different output devices: printers, monitors, smartphones, tablets, etc. For example, on a monitor screen displaying the page in a single design, and in its press - in the other.. This feature also allows you to hide or display certain elements of the document when displayed on different devices. CSS allows for device orientation (portrait or landscape), size and other parameters of the screen and instantly switches the view of a Web page, depending on what equipment and how we view the site.

Styles are typically stored in one or more specific files, a reference to that specified in all web pages. Thanks to this convenient style rule in one place, with the design elements is automatically changed on all pages that are associated with the specified file. Thus, it suffices to edit one style file and registration web pages related immediately change.