Inner containers.

Although it´s not required, you can wrap a .container for boxed inner layout or .container-fluid for fluid inner layout in a .navbar component.

Boxed inner layout

<nav class="navbar ...">
  <div class="container">
    ...
  </div>
</nav>

Fluid inner layout

<nav class="navbar ...">
  <div class="container-fluid">
    ...
  </div>
</nav>