Popup module related changes updated

src/app/app.module.ts

@@ -7,7 +7,7 @@ import { NumericTextBoxAllModule } from '@syncfusion/ej2-ng-inputs';
 import { CheckBoxAllModule, RadioButtonAllModule } from '@syncfusion/ej2-ng-buttons';
 import { ChartAllModule, AccumulationChartAllModule } from '@syncfusion/ej2-ng-charts';
 import { MultiSelectAllModule, DropDownListAllModule } from '@syncfusion/ej2-ng-dropdowns';
-import { DialogAllModule, TooltipAllModule, PopupAllModule } from '@syncfusion/ej2-ng-popups';
+import { DialogAllModule, TooltipAllModule } from '@syncfusion/ej2-ng-popups';
 import { DateRangePickerModule, DateRangePickerAllModule, DatePickerAllModule, TimePickerAllModule } from '@syncfusion/ej2-ng-calendars';
 
 import { routing } from './app.router';

src/assets/styles.scss

@@ -4,6 +4,7 @@ $accent: #4273F9;
 $accent-font: #fff;
 @import 'ej2-base/styles/material-definition.scss';
 @import 'ej2-base/styles/all.scss';
+@import 'ej2-base/styles/definition/_material.scss';
 @import 'ej2-buttons/styles/button/definition.scss';
 @import 'ej2-buttons/styles/button/material-definition.scss';
 @import 'ej2-buttons/styles/button/all.scss';