The navigation bar (search, breadcrumb) and menu use fixed positioning.

导航栏(搜索，痕迹导航)和菜单修正了对位。

youdao

Fixed positioning is a subcategory of absolute positioning. The only difference is that for a fixed positioned box, the containing block is established by the viewport.

固定定位是绝对定位的一种特殊情况，即他的包含框永远都是视口。

youdao

Ji 'nan fence wall with wedge block adjustment positioning, and nail fixed, not fixed with nails, wedge.

济南护栏上墙后用木楔块调整定位，再用射钉固定，不得用铁钉、木楔固定。

youdao