HTML 样式 - CSS

❮ 上一篇 下一篇 ❯

CSS stands for Cascading Style Sheets.

CSS saves a lot of work. It can control the layout of multiple web pages all at once.

CSS = Styles and Colors

Manipulate Text

Colors, Boxes

What is CSS?

Cascading Style Sheets (CSS) is used to format the layout of a webpage.

With CSS, you can control the color, font, the size of text, the spacing between elements, how elements are positioned and laid out, what background images or background colors are to be used, different displays for different devices and screen sizes, and much more!

Tip: The word cascading means that a style applied to a parent element will also apply to all children elements within the parent. So, if you set the color of the body text to "blue", all headings, paragraphs, and other text elements within the body will also get the same color (unless you specify something else)!

Using CSS

CSS can be added to HTML documents in 3 ways

Inline - by using the style attribute inside HTML elements

Internal - by using a

This is a heading

这是一个段落。

自己动手试一试 »

External CSS

An external style sheet is used to define the style for many HTML pages.

To use an external style sheet, add a link to it in the section of each HTML page

示例

This is a heading

这是一个段落。

自己动手试一试 »

The external style sheet can be written in any text editor. The file must not contain any HTML code, and must be saved with a .css extension.

Here is what the "styles.css" file looks like

"styles.css"

body { background-color: powderblue;}h1 { color: blue;}p { color: red;}

Tip: With an external style sheet, you can change the look of an entire web site, by changing one file!

CSS Colors, Fonts and Sizes

Here, we will demonstrate some commonly used CSS properties. You will learn more about them later.

The CSS color property defines the text color to be used.

The CSS font-family property defines the font to be used.

The CSS font-size property defines the text size to be used.

示例

Use of CSS color, font-family and font-size properties

This is a heading

这是一个段落。

自己动手试一试 »

CSS Border

The CSS border property defines a border around an HTML element.

Tip: You can define a border for nearly all HTML elements.

示例

Use of CSS border property:

p { border: 2px solid powderblue;}

自己动手试一试 »

CSS 内边距

The CSS padding property defines a padding (space) between the text and the border.

示例

Use of CSS border and padding properties

p { border: 2px solid powderblue; padding: 30px;}

自己动手试一试 »

CSS Margin

The CSS margin property defines a margin (space) outside the border.

示例

Use of CSS border and margin properties

p { border: 2px solid powderblue; margin: 50px;

}

自己动手试一试 »

Link to External CSS

External style sheets can be referenced with a full URL or with a path relative to the current web page.

示例

This example uses a full URL to link to a style sheet

自己动手试一试 »

示例

This example links to a style sheet located in the html folder on the current web site:

自己动手试一试 »

示例

This example links to a style sheet located in the same folder as the current page

自己动手试一试 »

You can read more about file paths in the chapter HTML File Paths.

Chapter Summary

Use the HTML style attribute for inline styling

Use the HTML