<button mat-raised-button (click)="addUser()">Add User</button>
<div class="spinner-container" *ngIf="dataSource.loading$ | async">
<mat-spinner></mat-spinner>
<button mat-raised-button (click)="addUser()">Add User</button>
<div class="spinner-container" *ngIf="dataSource.loading$ | async">
<mat-spinner></mat-spinner>