coreui-angular-ex/projects/coreui-angular/src/lib/toast/toast-header/toast-header.component.html

CoreUI Components Library for Angular

<ng-container>
  <ng-content></ng-content>
  <button *ngIf="closeButton" [cToastClose]="toast" [style]="{outline: 0}" aria-label="close" cButtonClose class="ms-auto"></button>
</ng-container>