Updated website

src/app/view/not-found/not-found.component.html

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+<div class="bg-white p-5">
+	<div class="card my-5 mx-auto p-5 text-center" style="max-width: 400px">
+		<h1 style="font-size: 4em">404</h1>
+		<h2 class="mt-3">Page not found</h2>
+		<button class="btn btn-outline-secondary rounded-pill px-4 mt-3" (click)="back()">Back</button>
+	</div>
+</div>

src/app/view/not-found/not-found.component.ts

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+import {Component} from '@angular/core';
+
+declare var navigation: any;
+
+@Component({
+	selector: 'app-not-found',
+	templateUrl: './not-found.component.html'
+})
+export class NotFoundComponent {
+	back() {
+		navigation.back();
+	}
+}