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What is CSS?

Beginner ⏱ 5 min read Updated: Jul 2026
  • CSS stands for Cascading Style Sheets
  • CSS is used to style and design web pages
  • It controls colors, fonts, spacing, and layout
  • CSS makes websites look attractive and user-friendly
  • CSS works with HTML to improve page design
  • It allows you to apply styles to multiple pages at once

What is CSS in Simple Words?

CSS (Cascading Style Sheets) is a language used to style web pages. HTML gives the structure of a webpage. We can change colors, fonts, space between elements, background, and layout to make a website more beautiful and easy to use.

Simple CSS Example

Example

<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
</head>
<body>

<h1>My First Heading</h1>
<p>My first paragraph.</p>

</body>
</html>

Example Explained

h1

This targets all heading tags (<h1>) and applies styles to them.

color

Used to change the text color (example: blue, red, black).

font-size

Controls how big or small the text appears on the screen.

p

This targets all paragraph elements (<p>).

line-height

Controls space between lines for better readability.

Why CSS is Important?

💡 Simple Answer: CSS is important because it makes websites look good and professional. Without CSS, websites look plain and unstyled.

How CSS Works with HTML

🌐
Working: HTML gives structure (like headings and paragraphs), and CSS adds style (like colors, layout, and design). Both work together to create a complete web page.

Ways to Add CSS

Types

h1 {
    color: blue;
    font-size: 32px;
}

p {
    color: gray;
    line-height: 1.6;
}
Note: External CSS is mostly used in real websites because it keeps code clean and reusable.

Real Life Example

Think of HTML as a house structure (walls, roof, rooms). CSS is like paint, furniture, and decoration that makes the house beautiful.