1. Scenario: .box needs to be scrolled in the height direction, which is implemented through the outer display container + overflow: hidden
There is an item list in the .box, showing a small image
When the mouse hovers the small image, the large image is displayed, and it is absolutely positioned relative to the item. At this time, the large image will be obscured by overflow:hidden in the horizontal direction. (No change to overflow-y:hidden)