About the application of CSS pseudo elements

Use CSS pseudo-elements: before and: after to insert content before and after the document without changing the original structure of the document. There is a good example below, you can refer to it

Use CSS pseudo-elements: before and :after can insert content before and after the document without changing the original structure of the document. Combined with box-shadow, it can achieve very cool effects.
Here are three examples:
1. Use :before and :after to add Background, such as putting quotation marks before and after a piece of text;
2. Use: before, :after, box-shadow to achieve 3D shadow effect;
3. Use: before, :after, box-shadow to achieve photo overlay effect.

 
 
 
 
 

 
 
 
CSS Demo :before, :after, box-shadow
 
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Achievement effect:

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