Style "mat-sort-header-sorted" has no effect in mat-table tutorial?

Using ::ng-deep can access class that is defined in tag as alternative to style it.

::ng-deep is deprecated and can be removed, also can be used

ViewEncapsulation.None in component decorator to avoid using ::ng-deep

 ::ng-deep .mat-sort-header-sorted {
     color: red; /*change color of header*/
 }

 ::ng-deep .mat-sort-header-arrow {
   color: red; /*change color of arrow*/
 }