Z - index project to do these days have a problem, said the position online: fixed, absolute and relative elements can set z - index can be effective, I there is a hidden box in a component, v - if, after the show hierarchy are covered all the time, to other components after setting low level also invalid
Tried one morning to find that solution
Because the box is hidden in the component, set the z hidden box - index, but the component level or lower than other components, as long as the component z - 999 index setting, can make the hierarchy of hidden box on top of