How to modify css in small program

Mini program is a lightweight application that is widely used in various fields due to its characteristics of easy dissemination and fast operation. During the development process of small programs, front-end developers need to master some basic skills, one of which is how to modify CSS. This article will introduce how to modify CSS in mini programs.

1. Basic concepts of CSS

CSS (Cascading Style Sheets) is the abbreviation of Cascading Style Sheets, which is used to define the presentation method of documents such as HTML and XML. CSS can control the display effect of each element in a web page, such as background color, font style, element size, position and spacing, etc. In mini programs, you can also use CSS to control the style of each component.

2. How to modify CSS in mini programs

The CSS in mini programs is mainly modified in two ways: global CSS styles and local CSS styles.

1. Global CSS styles

Global CSS styles refer to styles that can affect all components. In a mini program, global CSS styles can be defined in the app.wxss file. There is only one file, which can contain the definition of various CSS styles.

In the app.wxss file, you first need to declare all CSS styles:

/* app.wxss */
@import "wxss文件的路径";

/* 定义CSS样式 */
样式名称 {
    样式属性: 属性值;
}

It should be noted that in the mini program, the definition of CSS styles needs to add units. For example, the height of an element can be written as "50px" or "10rpx", and the color can be written directly in English words or use hexadecimal values.

After defining all CSS styles, we can reference the styles in app.wxss in other wxss files:

/* index.wxss */
@import "/app.wxss";

/* 使用CSS样式 */
.page {
    font-size: 30rpx;
    background-color: #ffffff;
}

In this example, we first introduce the app.wxss file into the index.wxss file, and then you can use the styles defined in it in the page node.

2. Partial CSS styles

Partial CSS styles refer to styles that only affect a certain component. In the mini program, each component can use its own unique class to define CSS styles. We can implement partial CSS style modification by defining the class attribute in the wxml file and defining the corresponding CSS style in the corresponding wxss file.

For example:

<!-- index.wxml -->
<view>Hello, world!</view>

/* index.wxss */
.page {
    font-size: 30rpx;
    background-color: #ffffff;
}

In this example, we define the class attribute in the view component and set it to "page". Then in the index.wxss file, the CSS style corresponding to the class is defined.

3. Summary

Through the above introduction, we understand how to modify CSS styles in mini programs. In actual development, CSS styles in mini programs can help us achieve various rich interface effects. I wish you all better results in mini program development!

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