How to realize the overall graying of the website?

Recommended reading:

filter

grayscale()

What are the magical uses of CSS filters

Special Note: The above three recommended articles are not written by me. I was going to write one of my own, but found that they were already well written, so I didn't. Put the link here as your own study notes for future reference.

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Origin blog.csdn.net/Kate_sicheng/article/details/128198902