<a routerLink="/Service/Sign_in"><button class="btn btn-success pull-right" > Add Customer</button></a>
<button type="button" class="btn btn-primary-outline pull-right" (click)="btnClick();"><i class="fa fa-plus"></i> Add</button>
// myComponent.component.ts file
import { Router } from '@angular/router';
constructor(private router: Router) {
}
// myComponent.component.thml
btnClick= function () {
this.router.navigateByUrl('/user');
};
<a routerLink="/Service/Sign_in"><button class="btn btn-success pull-right" > Add Customer</button></a>