Add a transition mask to the background image of the mobile detail page

[shanyan-wcx]

.layout-mobile .itemBackdrop {
  mask: linear-gradient(
    to bottom,
    #000 0%,
    rgba(0,0,0,0) 90%, 
    rgba(0,0,0,0) 100%
  );
  -webkit-mask: linear-gradient(
    to bottom,
    #000 0%,
    rgba(0,0,0,0) 90%, 
    rgba(0,0,0,0) 100%
  );
}