CSS Introduction

CSS is one of the most important tools in designing and beautifying the appearance of a website. We will teach you the basics and how to use CSS

CSS Can Change HTML Beauty Style

CSS is the language we use to style a Web page.

What is CSS?

  • CSS stands for Cascading Style Sheets
  • CSS describes how HTML elements are to be displayed on screen, 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 Demo - One HTML Page -
Multiple Styles!

Here we will show one HTML page displayed with four different stylesheets. Click
on the "Stylesheet 1", "Stylesheet 2", "Stylesheet 3", "Stylesheet 4" links
below to see the different styles:

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.
body {
background-color: lightblue;

h1 {
color: white;
text-align: center;

p {
font-family: verdana;
font-size: 20px;

CSS Solved a Big Problem

HTML was NEVER intended to contain tags for formatting a web page! HTML was
created to describe the content of a web page, like: <h1> This is a
heading </h1> <p> This is a paragraph.</p> When tags like <font>, and
color attributes were added to the HTML 3.2 specification, it started a
nightmare for web developers. Development of large websites, where fonts and
color information were added to every single page, became a long and expensive
process. To solve this problem, the World Wide Web Consortium (W3C) created CSS.
CSS removed the style formatting from the HTML page!

CSS Saves a Lot of Work!

The style definitions are normally saved in external .css files. With an
external stylesheet file, you can change the look of an entire website by
changing just one file!

CSS Syntax

A CSS rule consists of a selector and a declaration block.
CSS Introduction

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 with semicolons, and declaration blocks are
surrounded by curly braces.
p {
color: red;
text-align: center;

Example Explained

  • p is a selector in CSS (it points to the HTML element you want
    to style: <p>).
  • color is a property, and red is the property value
  • text-align is a property, and center is the
    property value

CSS Introduction