How to write css style

In web design, CSS style is a very important part, which can determine the appearance and layout of the page. This article will introduce readers to how to write CSS styles.

1. Understand the syntax of CSS styles

CSS style is a set of rules composed of "properties" and "values". The attribute specifies the specific content of the style, and the value is the specific expression of the attribute. The attributes and values ​​need to be separated by a colon ":", and the style rules need to be separated by a semicolon ";". The following is an example:

body{

background-color: lightblue;
color: white;
font-size: 20px;

}

In the above style code, we use the "body" tag to define the background color and text color of all web pages and text size.

2. Using ID and class selectors

In CSS styles, we can use ID and class selectors to style specific elements.

The ID selector starts with "#", followed by a unique ID name. For example:

header{

background-color: yellow;

}

This style defines the background color of an element with the ID name "header" as yellow.

The class selector starts with "." followed by a class name. For example:

.list{

margin: 10px;

}

This style defines an element with a class name of "list" that has a margin of 10 pixels.

3. Inheritance and overriding

In CSS styles, style rules have priority. If two rules conflict, the later rule will override the earlier one. However, some styles can be inherited, that is, child elements will automatically inherit the styles of their parent elements.

For example:

body{

color: black;
font-size: 16px;

}

p{

color: inherit;

}

In the above style , the text color of all paragraph elements will inherit the text color of the parent element (body), which is black.

4. Using CSS Frameworks

CSS frameworks are a quick way to style web pages and avoid duplication of work. Common CSS frameworks include Bootstrap, Foundation, Semantic UI, etc.

These frameworks provide predefined classes to easily style common web page elements, such as buttons, tables, navigation bars, etc.

5. Debugging CSS

When the CSS style cannot be displayed normally, we need to debug it through the browser's developer tools. After opening the browser's developer tools, you can view the HTML and CSS code of the web page, debug and modify it.

Summary

This article introduces the syntax and basic application of CSS styles, including ID and class selectors, inheritance and overrides, CSS framework and debugging. Mastering this knowledge allows us to better style web pages, thereby presenting users with a better user experience.

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