Update

src/app/app-routing.module.ts

 import { NgModule } from '@angular/core';
 import { Routes, RouterModule } from '@angular/router';
+import {OverviewComponent} from './overview/overview.component';
+import {SelectGameComponent} from './select-game/select-game.component';
+import {ErrorComponent} from './error/error.component';
 
-const routes: Routes = [];
+const routes: Routes = [
+  {
+    path: 'overview',
+    component: OverviewComponent,
+  },
+  {
+    path: '',
+    component: SelectGameComponent,
+  },
+  {
+    path: '**',
+    component: ErrorComponent,
+  }
+];
 
 @NgModule({
-  imports: [RouterModule.forRoot(routes)],
+  imports: [RouterModule.forRoot(routes, {
+    useHash: true,
+    enableTracing: false,
+    relativeLinkResolution: 'legacy'
+  })],
   exports: [RouterModule]
 })
 export class AppRoutingModule { }

src/app/app.component.html

-<div fxLayout="column" fxFlexFill style="background-color: #e7e7e7">
+<div fxLayout="column" fxFlexFill style="background-image: url(/assets/background.jpg)">
   <app-header>
   </app-header>
   <div fxFlex>
-    <app-select-game></app-select-game>
+    <router-outlet></router-outlet>
   </div>
   <app-footer>
     <mat-toolbar color="primary">

src/app/app.module.ts

@@ -13,6 +13,9 @@ import {MatButtonModule} from '@angular/material/button';
 import {MatFormFieldModule} from '@angular/material/form-field';
 import {MatInputModule} from '@angular/material/input';
 import {MatCardModule} from '@angular/material/card';
+import { OverviewComponent } from './overview/overview.component';
+import { ErrorComponent } from './error/error.component';
+import {MatProgressSpinnerModule} from '@angular/material/progress-spinner';
 
 @NgModule({
   declarations: [
@@ -20,6 +23,8 @@ import {MatCardModule} from '@angular/material/card';
     HeaderComponent,
     FooterComponent,
     SelectGameComponent,
+    OverviewComponent,
+    ErrorComponent,
   ],
   imports: [
     BrowserModule,
@@ -30,7 +35,8 @@ import {MatCardModule} from '@angular/material/card';
     MatButtonModule,
     MatFormFieldModule,
     MatInputModule,
-    MatCardModule
+    MatCardModule,
+    MatProgressSpinnerModule,
   ],
   providers: [],
   bootstrap: [AppComponent]

src/app/error/error.component.html

+<div style="text-align: center; margin-left: 15em; margin-right: 15em; margin-top: 5em;">
+  <h3>
+    Leider konnte die Seite nicht erreicht werden, bitte überprüfen Sie den Link oder kehren Sie auf die <a href="router.navigate(['/overview'])">Startseite</a>  zurück
+  </h3>
+  <br>
+  <mat-progress-spinner color="primary" mode="mode" value="value">
+  </mat-progress-spinner>
+</div>
+
+

src/app/error/error.component.spec.ts

+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ErrorComponent } from './error.component';
+
+describe('ErrorComponent', () => {
+  let component: ErrorComponent;
+  let fixture: ComponentFixture<ErrorComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ ErrorComponent ]
+    })
+    .compileComponents();
+  });
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ErrorComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/error/error.component.ts

+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-error',
+  templateUrl: './error.component.html',
+  styleUrls: ['./error.component.scss']
+})
+export class ErrorComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+}

src/app/header/header.component.html

 <mat-toolbar color="primary">
+
   <span>Tabu</span>
+  <a href="router.navigate(['/overview'])">
+    <img style="display: inline;" src="./assets/Icon.png" alt="logo" height="30px" width="30"/>
+  </a>
 </mat-toolbar>

src/app/overview/overview.component.html

+<div style="text-align: center; margin-left: 15em; margin-right: 15em; margin-top: 5em;">
+  <h2>Du spielst in Team rot!</h2>
+  <br>
+  <br>
+  <br>
+  <mat-card>
+    <mat-card-title>Spielstand</mat-card-title>
+    <mat-card-content>
+      <br>
+      <center>
+        <table>
+          <tr>
+            <th>Team rot</th>
+            <th>Team blau</th>
+          </tr>
+          <tr>
+            <th>0</th>
+            <th>0</th>
+          </tr>
+        </table>
+      </center>
+    </mat-card-content>
+    <mat-card-actions>
+      <br>
+      <br>
+      <mat-card-title>Rot ist am Zug:</mat-card-title>
+      <br>
+      <button mat-raised-button color="primary">Nächste Runde</button>
+      <button mat-raised-button color="primary">Neues Spiel starten</button>
+    </mat-card-actions>
+  </mat-card>
+</div>

src/app/overview/overview.component.scss

+table {
+  width: 50%;
+}

src/app/overview/overview.component.spec.ts

+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { OverviewComponent } from './overview.component';
+
+describe('OverviewComponent', () => {
+  let component: OverviewComponent;
+  let fixture: ComponentFixture<OverviewComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ OverviewComponent ]
+    })
+    .compileComponents();
+  });
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(OverviewComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/overview/overview.component.ts

+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-overview',
+  templateUrl: './overview.component.html',
+  styleUrls: ['./overview.component.scss']
+})
+export class OverviewComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}

src/app/select-game/select-game.component.html

@@ -6,18 +6,18 @@
   <br>
   <mat-card>
     <mat-card-title>Spielsuche</mat-card-title>
-    <mat-card-subtitle>Finde oder erstelle ein Spiel über den Spielnamen</mat-card-subtitle>
+    <mat-card-subtitle>Finde ein Spiel über den Spielnamen oder erstelle ein neues</mat-card-subtitle>
     <mat-card-content>
       <form>
         <mat-form-field>
           <mat-label>Spielname</mat-label>
-          <input type="text" matInput>
+          <input type="text" pattern="[0-9A-Za-z]*" matInput>
         </mat-form-field>
       </form>
     </mat-card-content>
     <mat-card-actions>
       <button mat-raised-button color="primary">Spiel erstellen</button>
-      <button mat-raised-button color="primary">Spiel beitreten</button>
+      <button mat-raised-button color="primary" (click)="joinGame($event)">Spiel beitreten</button>
     </mat-card-actions>
   </mat-card>
 </div>

src/app/select-game/select-game.component.ts

 import { Component, OnInit } from '@angular/core';
+import {Router} from '@angular/router';
 
 @Component({
   selector: 'app-select-game',
@@ -7,9 +8,16 @@ import { Component, OnInit } from '@angular/core';
 })
 export class SelectGameComponent implements OnInit {
 
-  constructor() { }
+  constructor(private router: Router) { }
 
   ngOnInit(): void {
   }
 
+  getSpielname(event: any): void {
+    event.target.value;
+  }
+
+  joinGame(event:any): void {
+    this.router.navigate(['/overview']);
+  }
 }