it works if you use height:100% globally, but there will be a problem. The fixed content will cover the scroll bar;
however, it becomes invalid when the global setting is min-height:100%; how to solve the problem that
min-height:100% does not take effect;
Why doesn't it work?
can it be solved: https://stackoverflow.com/que.
depends on whether the height of the parent element is set. If the specific height is set, it is feasible. If the percentage is set, it depends on the parent element of the parent element, and then until the element with the specific height is set or the root node
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