1
 2.backdrop {
 3  position: fixed;
 4  top: 0;
 5  left: 0;
 6  z-index: $z-index-backdrop;
 7
 8  width: 100%;
 9  height: 100%;
10
11  background-color: $loading-backdrop-bg-color;
12
13  visibility: hidden;
14  opacity: 0;
15
16  &.visible {
17    visibility: visible;
18  }
19  &.active {
20    opacity: 1;
21  }
22
23  @include transition($loading-backdrop-fadein-duration opacity linear);
24}