css - Sidenav backdrop not displayed -


i try add sidenav angular/material website. works fine expect backdrop : didn't appear on main page. find code here : https://plnkr.co/edit/dmmz9dmozasfmexwgjsd?p=options (first time using tools, advices welcomed !)

in menu.component.html :

<md-toolbar>     <div class="sidenav-button">         <button type="button" md-icon-button (click)="sidenav.toggle()">             <md-icon>reorder</md-icon>         </button>     </div> </md-toolbar>  <md-sidenav-container fullscreen class="sidenav-container">     <md-sidenav #sidenav mode="push" class="sidenav left-nav" opened="false">         <md-nav-list>             <a md-list-item>                home             </a>             <a md-list-item>                channels             </a>         </md-nav-list>     </md-sidenav> </md-sidenav-container>

i copy/paste example official documentation (https://material.angular.io/components/sidenav/overview) no result..

thanks


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