Understanding CSS

CSS is a style sheet language used to describe the presentation of a web page.

The language is designed to separate concerns. It allows the design, layout, and presentation of a web page to be defined separately from content semantics and structure. This separation keeps source code readable and lets a designer update styles separately from a developer who might create the page structure or a web editor who is changing content on a page.

A set of CSS rules in a style sheet determines how an HTML document is displayed to the user. It can determine whether elements in the document are rendered, how they are laid out on the web page, and their aesthetic appearance.

In the next section, we will look at the syntax of CSS.

Syntax

A CSS declaration is made of two parts: a property and a value. The property is the name for some aspect of style you want to change; the value is what you want to set it to.

Here is an example of a CSS declaration:

color:...