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Introduction to CSS

Beginner ~5 min read

What is CSS?

CSS stands for Cascading Style Sheets. It is the language used to style and layout web pages. While HTML provides the structure and content, CSS makes it look beautiful.

Think of HTML as the skeleton and organs of a body, and CSS as the skin, hair, and clothes that make it presentable.

Why Use CSS?

  • Separation of Concerns - Keep content (HTML) separate from presentation (CSS)
  • Reusability - One stylesheet can style multiple pages
  • Maintainability - Change the entire site's look by editing one file
  • Responsive Design - Adapt layouts for different screen sizes
  • Performance - Faster page loads with external stylesheets

CSS Syntax

CSS consists of rules. Each rule has two main parts:

selector {
  property: value;
  property: value;
}
  • Selector - Targets the HTML element(s) to style
  • Property - The aspect you want to change (e.g., color, font-size)
  • Value - The setting for that property

Your First CSS

Let's see CSS in action! The example below shows HTML with CSS styling. Try changing the color value in the CSS tab and click "Run" to see the result.

HTML
CSS
JS
Try It: Change #2563eb to red or #10b981 and see the heading color change!

Key Takeaways

  • CSS stands for Cascading Style Sheets
  • CSS is used to style and layout web pages
  • CSS uses selectors to target HTML elements
  • CSS rules consist of properties and values
  • CSS makes websites beautiful and responsive

Quick Quiz

What does CSS stand for?

A
Computer Style Sheets
B
Cascading Style Sheets
C
Creative Style System
D
Colorful Style Sheets
Next Adding CSS