add theme and hammerjs dependency

src/main.ts

@@ -4,6 +4,8 @@ import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
 import { AppModule } from './app/app.module';
 import { environment } from './environments/environment';
 
+import 'hammerjs';
+
 if (environment.production) {
   enableProdMode();
 }

src/styles.css

@@ -1 +1,2 @@
 /* You can add global styles to this file, and also import other style files */
+@import '~@angular/material/prebuilt-themes/indigo-pink.css';