Wie mache ich eine 100% Breite der Sucheingabe in der Navigationsleiste?

Das Feld ist in der Breite begrenzt:

<nav class="navbar navbar-light navbar-dark bg-inverse">
  <a class="navbar-brand" href="#">Navbar</a>
  <ul class="nav navbar-nav">
    <li class="nav-item active">
      <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Features</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">Pricing</a>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">About</a>
    </li>
  </ul>

  <ul class="nav navbar-nav pull-xs-right">
    <li class="nav-item">
      <form class="form-inline ">
        <input class="form-control" type="text" placeholder="Search">
        <button class="btn btn-outline-success" type="submit">Search</button>
      </form>
    </li>
    <li class="nav-item">
      <a class="nav-link" href="#">User Name</a>
    </li>
  </ul>
</nav>

Hier ist die Geige:

https: //jsfiddle.net/Dieselnick/tdoz2o4d