如何在bootstrap中固定顶部导航栏4

我试图在Bootstrap 4 apla 6中居中放置一个固定的顶级导航栏 ，但它并没有将它居中，而是完全填满了顶部。 我怎样才能使它固定在顶部居中。 我已经将导航栏放在网站上提到的容器中，但它不是居中。

请看下面的图片

居中但不固定在顶部

固定在顶部，但填充宽度，即使它在一个容器中

<div class="container">
  <nav class="navbar fixed-top navbar-toggleable-md navbar-inverse bg-inverse ">
      <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarSupportedContent"
        aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
      </button>
      <a class="navbar-brand" href="#">Navbar</a>
      <div class="collapse navbar-collapse" id="navbarSupportedContent">
        <ul class="navbar-nav mr-auto">
          <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="#">Link</a>
          </li>
          <li class="nav-item">
            <a class="nav-link disabled" href="#">Disabled</a>
          </li>
        </ul>
        <form class="form-inline my-2 my-lg-0">
          <input class="form-control mr-sm-2" type="text" placeholder="Search">
          <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
      </div>
    </nav>
   </div>

---

使导航栏成为一个容器...

http://www.codeply.com/go/sJbrJciQia

<nav class="navbar container navbar-toggleable-sm fixed-top navbar-inverse bg-inverse">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbar1">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Brand</a>
    <div class="collapse navbar-collapse" id="navbar1">
        <ul class="navbar-nav">
            <li class="nav-item active">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
        <ul class="navbar-nav ml-auto">
            <li class="nav-item active">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
    </div>
</nav>

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