Why set the background color of the body, the color does not cover the entire page-CodePudding

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Why set the background color of the body, the color does not cover the entire page

Time：01-29

But like this

CodePudding user response:

Cross default is 100%, but 100% HTML tags and vertical body tag is not the default, manually

CodePudding user response:

The code, I'll give you solve