问角7\mat-标签活动的\\样式没有反射

EN

<div class="navigation">
>         <mat-tab-group disableRipple="true"  selectedIndex="0">
>             <mat-tab label="Label1"> </mat-tab>
>             <mat-tab label="label 2">  </mat-tab>
>             <mat-tab label="Label 3">  </mat-tab>
>         </mat-tab-group>
>     </div>

.mat-ink-bar{
>         background-color: #ffffff !important;
>         border-bottom-color:solid #FFFFFF!important;
>         width: 113px !important;
>         height:4px !important;
>         margin-left: 2rem;
>         margin-bottom:0px;
>         
>     }
>     
>     .mat-tab-label, .mat-tab-label-active{
>         color:#FFFFFF;
>         background-color: transparent;
>         font-family: "verdana";
>         font-size: 20px;
>         font-weight:500;
>         max-width: 113px;
>         padding: 0px;
>         margin:0px;
>     }