How to write and apply CSS code

CSS, the full name of Cascading Style Sheets, is a style sheet language used for web design. It is used to describe the appearance of HTML or XML (applied to any XML document, including SVG or XHTML) documents. and layout. CSS works by defining properties related to specific tags to specify how these tags are rendered on the browser, thereby achieving the style, typography, and layout of web pages.

In web design, CSS plays a very important role because it can make the appearance and layout of the web page more beautiful and easy to operate. In order to use CSS, we need to know how to write and apply CSS code.

1. Writing CSS code

CSS code consists of selectors and declarations. Selectors are used to specify HTML tag elements in web pages, while declarations are used to define the styles of these elements. Here is a CSS code example:

p {
    color: red;
    font-size: 18px;
}

In the above example, p is a selector that matches all <p></p> tags and Styles are interpreted as a CSS declaration block. color and font-size are specific CSS properties, and their values ​​are red and 18px respectively.

2. Embed CSS code

Embedding CSS code means placing the CSS code in the ## between the tags of the HTML document Within the #

    

这是一段红色的文本，字号为18像素。

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