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

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">

  <div class="collapse navbar-collapse"
       [ngClass]="{ 'show': navbarOpen }">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item">
        <a class="nav-link" href="home">Startseite</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="einkaufszettel1">Einkaufszettel1</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="einkaufszettel2">Einkaufszettel2</a>
      </li>
    </ul>
  </div>
</nav>