Angular2 + Material : mat-toolbar casts no shadow over mat-sidenav-container despite mat-elevation-z*

Question

试图模仿 Material guide 的外观，我无法让工具栏的阴影呈现在 mat-sidenav-container 元素之上:

显示工具栏和 sidenav 的页面，但投影不可见:

单独显示工具栏的页面，渲染了阴影:

看HTML代码，再简单不过了。我错过了什么？谢谢...

app.component.html

<mat-toolbar class="mat-elevation-z6" color="primary">
  toolbar
</mat-toolbar>

<mat-sidenav-container >

  <!-- Side menu -->
  <mat-sidenav mode="side" opened="true">

    <h3>Menu 1</h3>
    <ul>

      <!-- Home (aka dashboard) -->
      <li>
        <a routerLink="/">dashboard</a>
      </li>

      <!-- Home (aka dashboard) -->
      <li>
        <a routerLink="/resolutions">resolutions</a>
      </li>
    </ul>

    <!-- List resolutions -->
    <h3>Menu 2</h3>
    <ul>
      <li>
        <a>incentive</a>
      </li>
    </ul>

  </mat-sidenav>

  <!-- Routed contents -->
  <div class="contents">
    <router-outlet></router-outlet>
  </div>

</mat-sidenav-container>

Answer 1

将此添加到您的样式中:

.mat-toolbar {
  position: relative;
  z-index: 2;
}