mcs-ng-material/resources/lib/angular-material/modules/js/backdrop/backdrop.css

MCS NG-Meterial is based on mcs-web.

/*!
 * AngularJS Material Design
 * https://github.com/angular/material
 * @license MIT
 * v1.1.6
 */
md-backdrop {
  -webkit-transition: opacity 450ms;
  transition: opacity 450ms;
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 50; }
  md-backdrop.md-menu-backdrop {
    position: fixed !important;
    z-index: 99; }
  md-backdrop.md-select-backdrop {
    z-index: 81;
    -webkit-transition-duration: 0;
            transition-duration: 0; }
  md-backdrop.md-dialog-backdrop {
    z-index: 79; }
  md-backdrop.md-bottom-sheet-backdrop {
    z-index: 69; }
  md-backdrop.md-sidenav-backdrop {
    z-index: 59; }
  md-backdrop.md-click-catcher {
    position: absolute; }
  md-backdrop.md-opaque {
    opacity: .48; }
    md-backdrop.md-opaque.ng-enter {
      opacity: 0; }
    md-backdrop.md-opaque.ng-enter.md-opaque.ng-enter-active {
      opacity: .48; }
    md-backdrop.md-opaque.ng-leave {
      opacity: .48;
      -webkit-transition: opacity 400ms;
      transition: opacity 400ms; }
    md-backdrop.md-opaque.ng-leave.md-opaque.ng-leave-active {
      opacity: 0; }