MDT5_Angular/src/app/navbar/navbar.component.html

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
  <a class="navbar-brand" href="#">
    Menü
  </a>

  <button class="navbar-toggler" type="button"
          (click)="toggleNavbar()">
    <span class="navbar-toggler-icon"></span>
  </button>

  <div class="collapse navbar-collapse"
       [ngClass]="{ 'show': navbarOpen }">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item">
        <a class="nav-link" href="#">Einkaufszettel 1</a>
      </li>

      <li class="nav-item">
        <a class="nav-link" href="#">Einkaufszettel 2</a>
      </li>
    </ul>
  </div>
</nav>