CSS (Cascading Style Sheets) is used to style and format web pages. It allows developers to control the look of multiple web pages from one external file which saves time and effort. CSS was created to separate design from content, solving the problem of formatting directly in HTML.
2. CSS Syntax
A CSS rule is made up of a selector and a declaration block. The selector targets the HTML element to style; the declaration block contains CSS properties and their values, which define the styles. Declarations are separated by semicolons and enclosed in curly braces which allow multiple styles for a single element.
3. CSS Selectors
CSS selectors target specific HTML elements for styling. Simple selectors include: element, id, and class selectors; these allow you to style elements based on their name, unique id, or shared class. You can also use the universal selector to style all elements on a page or group selectors to apply the same style to multiple elements at once.