styled toggle button and Added alert service

src/app/services/alert.service.spec.ts

@@ -0,0 +1,16 @@
+import { TestBed } from '@angular/core/testing';
+
+import { AlertService } from './alert.service';
+
+describe('AlertService', () => {
+  let service: AlertService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(AlertService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});

src/app/services/alert.service.ts

@@ -0,0 +1,22 @@
+import { Injectable } from '@angular/core';
+import { AlertController } from '@ionic/angular';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AlertService {
+
+  constructor(public alertController: AlertController) { }
+
+  async presentAlert(message:string) {
+    const alert = await this.alertController.create({
+      cssClass: 'my-custom-class',
+      header: 'Mensagem do sistema',
+      message: message,
+      buttons: ['OK']
+    });
+
+    await alert.present();
+  }
+
+}