Lot of visual improvements

src/app/app.module.ts

@@ -22,6 +22,7 @@ import { TaskDisplayComponent } from './active-list-tasks/task-display/task-disp
 import {MatCheckboxModule} from '@angular/material/checkbox'; 
 import { TaskListService } from './core/service/task-list.service';
 import { StorePersistenceService } from './core/service/store-persistence.service';
+import {MatTooltipModule} from '@angular/material/tooltip'; 
 
 @NgModule({
   declarations: [
@@ -45,7 +46,8 @@ import { StorePersistenceService } from './core/service/store-persistence.servic
     MatButtonModule,
     ReactiveFormsModule,
     MatSnackBarModule,
-    MatCheckboxModule
+    MatCheckboxModule,
+    MatTooltipModule
   ],
   providers: [
     CookieService,