CSS (Cascading Style Sheets)

What is CSS?

CSS (Cascading Style Sheets) is a stylesheet language used for describing the presentation of a document written in HTML or XML. It controls the layout, colors, fonts, and overall visual appearance of web pages.

Key Features of CSS

  • Styling: Defines the visual appearance of HTML elements.
  • Selectors: Allows targeting of specific HTML elements for styling.
  • Box Model: Provides a framework for layout control, including margins, borders, padding, and content.
  • Media Queries: Enables responsive design by applying different styles based on device characteristics.

How Does CSS Work?

CSS works by applying styles to HTML elements based on selectors. Styles are defined in a CSS file or within HTML using the <style> tag. The browser parses the CSS and applies the defined styles to the matching HTML elements, rendering the webpage according to the specified design.

Best Practices for Using CSS

  • Organize Styles: Use separate CSS files for better organization and maintainability.
  • Use Classes and IDs: Apply classes and IDs for reusable and specific styling.
  • Responsive Design: Implement media queries for responsive design.
  • Minimize Inline Styles: Avoid inline styles to keep HTML clean and maintainable.


HTML defines the structure and content of a webpage, while CSS controls its visual presentation.

Yes, CSS includes properties and rules for creating animations and transitions.

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