CSS Basics

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 What is CSS?

CSS stands for Cascading Style Sheets. It is a styling language used to control the layout and appearance of web pages written in HTML or XML. CSS is used to separate the presentation of a document from its structure, which is defined in the HTML code.

What does CSS do?


CSS is used to:

  •  CSS Controls the layout of web pages, including the position and size of elements
  •  It sets the visual style of web pages, including colors, fonts, and backgrounds
  •  It adds interactivity to web pages, such as hover effects and animations
  •  It improves the accessibility of web pages, by providing alternative styles for users with disabilities

How does CSS work?


CSS works by selecting elements on a web page and applying styles to them. The styles are defined in a CSS file, which is linked to the HTML file. The browser then reads the CSS file and applies the styles to the corresponding elements on the web page.

Types of CSS


There are three types of CSS:

  •  Internal CSS: This type of CSS is written directly in the HTML file, using the `<style>` tag.
  •  External CSS: This type of CSS is written in a separate file, which is linked to the HTML file using the `<link>` tag.
  •  Inline CSS: This type of CSS is written directly in the HTML file, using the `style` attribute.

Benefits of CSS


The benefits of using CSS include:

  •  Improved maintainability: CSS makes it easy to update the style of a web page, without having to modify the HTML code.
  •  Improved accessibility: CSS makes it easy to provide alternative styles for users with disabilities.
  •  Improved performance: CSS can improve the performance of a web page, by reducing the amount of HTML code needed.
  •  Improved flexibility: CSS makes it easy to create different styles for different devices and screen sizes.

Common CSS concepts


Some common CSS concepts include:

  •  Selectors: These are used to select elements on a web page, and apply styles to them.
  •  Properties: These are used to define the styles that are applied to elements.
  •  Values: These are used to define the values of properties.
  •  Units: These are used to define the units of measurement for values.


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