everything is fine when initializing the page on iphonex. When you click on a details page and come back, the fixed is positioned and hidden on the top public head. It seems that the whole page has moved a distance of constant (safe-area-inset-top) up, and the bottom margin has also become larger, but pulling the head down will come out again, and the normal online sliding head will not be hidden. Ask for advice on what causes this? Viewpoint-fit=cover is added, but it has no effect