Let's briefly talk about the role of negative margin values

We all use margin in CSS, but setting margin to a negative number may not be easy to handle. Negative margin values ​​are not a hack, and negative margin values ​​follow the document flow; if negative margin values ​​are used to move an element upward, then it is relevant Elements will also be displaced accordingly; negative margin values ​​are well compatible with various browsers.

1. There are two borders with different background colors. No matter which side increases, the other side also becomes higher

2. Implement adaptive

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