The absolutely positioned img in CSS cannot be covered by the mask layer. Please solve it! ! _html/css_WEB-ITnose

As in the title

Reply to the discussion (solution)

It may be because the z-index of the img is greater than the mask layer's

Post the code,

There are several reasons: 1. It may be that the outer frame of absolute positioning is not set, causing the absolutely positioned element to move outside the browser;
2. The mask layer is floating, but the absolute positioning layer is not set. z-index;
3. On the same floor, the hierarchical relationship of the mask layer may exceed the absolutely positioned img.

Thanks stongyann, the problem lies in the second point mentioned