This article mainly talks 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. Negative margin values follow the document flow. ; If you use negative margin values to move an element upward, the related elements will also shift accordingly; negative margin values are well compatible with various browsers.
1. There are two borders with different background colors. No matter which side increases in height, the other side also becomes higher.
2. Implement adaptive
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