app.component.ts
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	import {Component, OnInit} from '@angular/core';
	import { OverlayContainer} from '@angular/cdk/overlay';
	import {Subscription} from 'rxjs';
	import {ActivatedRoute, Params} from '@angular/router';

	@Component({
	selector: 'app-root',
	templateUrl: './app.component.html',
	styleUrls: ['./app.component.css']
	})
	export class AppComponent implements OnInit {
	title = 'nietzsche app';
	theme = 'standard-theme';

	fullScreen: string;
	queryParamSub: Subscription;

	constructor(private overlayContainer: OverlayContainer, private activatedRoute: ActivatedRoute) {
	}

	ngOnInit() {
	this.overlayContainer.getContainerElement().classList.add(this.theme);
	this.queryParamSub = this.activatedRoute.queryParams.subscribe( (queryParams: Params ) => {
	this.fullScreen = queryParams.fullscreen;
	});

	}

	onThemeChange() {
	this.overlayContainer.getContainerElement().classList.add(this.theme);
	}
	}