how to add toaster in angular 9

npm install ngx-toastr --save
npm install @angular/animations --save

// angular.json
"styles": [
  "styles.scss",
  "node_modules/ngx-toastr/toastr.css" // try adding '../' if you're 
  										// using angular cli before 6
]

// app.module
import { CommonModule } from '@angular/common';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { ToastrModule } from 'ngx-toastr';

imports: [
    CommonModule,
    BrowserAnimationsModule, // required animations module
    ToastrModule.forRoot(), // ToastrModule added
  ],
  
// component
import { ToastrService } from 'ngx-toastr';

constructor(private toastr: ToastrService) {}

showSuccess() {
  this.toastr.success('Hello world!', 'Toastr fun!');
}