CSS Introduction

CSS Tutorial

Last Updated : 27 Feb, 2025

CSS stands for Cascading Style Sheets. It is a stylesheet language used to style and enhance website presentation.

CSS is one of the main three components of a webpage along with HTML and JavaScript.
- HTML adds Structure to a web page.
- JavaScript adds logic to it and CSS makes it visually appealing or stylish. It controls the layout of a web page i.e. how HTML elements will be displayed on a webpage.
CSS was released (in 1996), 3 years after HTML (in 1993). The main idea behind its use is, it allows the separation of content (HTML) from presentation (CSS). This makes websites easier to maintain and more flexible.

How to Add CSS to HTML?

There are three different ways to add CSS styles to an HTML document:

1. Inline CSS

Use the style attribute on the HTML element to add styles to the web page. It is used for small projects.

HTML

<!-- File name: index.html -->
<html>
<body>  
    <!-- Using Inline CSS -->
    <h3 style="text-align: center;">
      	Welcome To GFG
 	</h3>
  
    <p>CSS Tutorial - GeeksforGeeks</p>
</body>
</html>

2. Internal CSS

Place the CSS styles within a <style> tag inside the HTML file, usually inside the <head> section.

HTML

<!-- File name: index.html -->
<html>
<head>    
  	<!-- Using Internal CSS -->
    <style>
        h3 {
        	color: green;
        }
    </style>
</head>
<body>  
    <!-- CSS is applied here -->
    <h3>Welcome To GFG</h3>
  
    <p>CSS Tutorial - GeeksforGeeks</p>
</body>
</html>

3. External CSS

Create a separate CSS file with a .css extension and link this file to your HTML file using the <link> tag. It consider the best practice to add CSS into HTML File.

HTML

<!-- File name: index.html -->
<html>
<head>
  	<!-- Importing External CSS -->
    <link rel="stylesheet" href="style.css" /> 
</head>
<body>
    <p>CSS Tutorial - GeeksforGeeks</p>
</body>
</html>

CSS

/* Write CSS Here *//* External CSS */
/* File name: style.css */
p {
  	text-align: center;
}

CSS Fundamentals

This section covers the fundamental topics of CSS.

CSS Properties

Styling HTML Elements with CSS

This Section contains all the information about various styling techniques in CSS.

CSS Projects for Beginners

Now you have a basic understanding of CSS. So start with some beginner level projects to clear your concept and to implement in real world applications.

CSS Responsive Design

This Section contains all the designing techniques in CSS used for various use cases

Logic Implementations in CSS

This Section Covers all the mathematical logic that can be applied in CSS.

Interesting Facts in CSS

This section covers all the interesting facts and features that make CSS a powerful and versatile tool for web design.

Advanced CSS Topics

This Section contains various information about advanced topics in CSS

CSS Online Quizzes

To achieve a solid understanding of CSS, it’s essential to engage with CSS quizzes and MCQs. These CSS quizzes can enhance your ability to solve similar questions and improve your problem-solving skills.

Here are some quiz articles related to CSS 3:

CSS Interview Questions

Don't miss our CSS Interview Questions and Answers before going for your interview.

Bonus Resource: CSS Cheat-Sheet for Beginners (2025) - A Basic Guide to CSS.

CSS Frameworks

CSS Frameworks are a collection of pre-written CSS files (and sometimes JavaScript components) that offer reusable code for common tasks such as buttons, grids, forms, and navigation menus.

These CSS frameworks provide a set of standardized, reusable components and a predefined structure, allowing developers to create responsive and aesthetically pleasing websites with reduced effort.

CSS Frameworks

Other Useful CSS Resources
CSS Complete Guide - A to Z CSS Concepts
Learn CSS: Free CSS Course For Beginners

CSS Versions

CSS 1: The foundation, released in 1996, introduced basic styling capabilities for fonts, colors, and margins.
CSS 2: Expanded in 1998, adding positioning elements, pseudo-classes, and improved layout options.
CSS 2.1: Further refinements in 2004, including improvements to inheritance and box model properties.
CSS 3: Introduced from 2001 onwards, CSS3 isn't a single version but a collection of modules adding features like animations, media queries, and web fonts. It's constantly evolving.

CSS Preprocessors

This section contains information about the preprocessors used in CSS.

Why learn CSS?

CSS is essential for modern web development. Here's why you should learn it:

1. Enhance Visual Appeal

CSS allows you to style your web pages, making them visually appealing and engaging. Here’s why it matters:

User Experience (UX): Well-designed websites attract and retain users. CSS enables you to create beautiful layouts, choose fonts, and apply colors that resonate with your audience.

2. Responsive Design

In today’s mobile-first world, responsive design is crucial. CSS empowers you to:

Media Queries: Adapt your layout based on screen size (desktop, tablet, mobile).
Flexbox and Grid: Create flexible, adaptive designs that look great on any device.

3. Improve Website Performance and SEO

CSS indirectly impacts your site’s SEO. Here’s how:

Page Load Speed: Well-organized CSS files load faster, improving user experience. Google considers page speed as a ranking factor.
Structured Content: Properly styled HTML (thanks to CSS) enhances readability for search engines and users.
Mobile Friendliness: Responsive CSS ensures your site performs well on mobile devices, positively affecting rankings.

4. Efficient Maintenance

CSS promotes clean code and separation of concerns:

Modularity: Separate CSS files allow easy updates without affecting other parts of your site.
Consistency: Apply styles consistently across your site using classes and IDs.

5. Career Opportunities

Learning CSS opens doors to various roles:

Front-End Developer: Mastering CSS is essential for front-end development.
Web Designer: CSS skills are fundamental for creating stunning web layouts.
Full-Stack Developer: Understanding CSS complements back-end skills.

CSS Introduction

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