css.（css网页设计）

## CSS: The Style Sheet Language of the Web

简介

Cascading Style Sheets (CSS) is a fundamental language used to style web pages. It dictates the visual presentation of HTML documents, controlling everything from colors and fonts to layouts and animations. CSS allows web designers and developers to separate content from presentation, making web pages more maintainable, accessible, and visually appealing.

1. What does CSS do?

CSS governs the following aspects of web page design:

Colors:

Define the color of text, backgrounds, borders, and other elements.

Fonts:

Specify font families, sizes, styles (bold, italic), and weights (light, bold).

Layout:

Control the positioning and arrangement of elements on the page. This includes using techniques like flexbox and grid layout.

Spacing:

Set margins, padding, and spacing between elements.

Dimensions:

Define the width, height, and size of elements.

Images:

Style images, including their size, borders, and alignment.

Animations:

Add dynamic effects, transitions, and animations to elements.

Responsiveness:

Adapt the layout and appearance of a website for different screen sizes and devices.

2. How CSS Works

CSS code is written in a separate file (often with the `.css` extension) or within the `