Why is the css style not taking effect?

The reasons why the css style does not work are: 1. The html tag is not completely written, missing "", etc.; 2. The style is cascaded; 3. There is an error in the CSS syntax; 4. The encoding of the style sheet saved is wrong.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

1. The html tags are not completely written, leaving out "" or "/" etc.

This is one of the most common reasons for layout design failure. It’s always surprising when we learn how many delicate layout designs fail because of this.

2. Styles are cascaded

If it is caused by cascading, you need to increase the priority of the style.

Commonly used methods include: adding elements to the selector to increase its specificity, or adding !important in the space before the style semicolon, as follows:

background-color: pink !important;

3. CSS syntax error

Take the developer tools of Google Chrome as an example. Generally, grammatical errors will be displayed as the style is crossed out, there will be an icon prompt on the left side of the style, and an English prompt will be displayed when the mouse is moved into it. As shown in the figure below:

General grammatical errors include:

1. Wrong attribute name, attribute value does not comply with the specification;

2. The following symbols use Chinese or full-width symbols:

，；｛｝：

4. The encoding error when saving the style sheet

If you suspect that the encoding of the CSS table is wrong, you can directly save the css file as utf-8 Just save the encoding as a file.

Recommended learning: css video tutorial

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