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What Is CSS?

• CSS stands for Cascading Style Sheets.
• CSS describes how HTML elements are to be displayed on screen, on paper, or in other media.
• CSS saves a lot of work. It can control the layout of multiple web pages all at once.
• External stylesheets are stored in CSS files.
• CSS was introduced in 1996, so in the first few years of the Web, there was only HTML: https://www.w3.org/TR/1999/REC-CSS1-19990111

Why Use CSS?

CSS is used to define styles for your web pages, including the design, layout, and variations in display for different devices and screen sizes.

CSS Syntax

A CSS rule-set consists of a selector and a declaration block:

• The selector points to the HTML element you want to style.
• The declaration block contains one or more declarations separated by semicolons.
• Each declaration includes a CSS property name and a value, separated by a colon.
• Multiple CSS declarations are separated by semicolons.
• Declaration blocks are surrounded by curly braces.
• In this example, all p tag elements will be center-aligned, with a red text color:

p {
  color: red;
  text-align: center;
}