如何将Bootstrap导航栏中的表单元素（搜索框）居中？

Question

我试图让搜索框位于我的Bootstrap导航栏的中心。删除导航栏左侧似乎会破坏导航栏上的对齐。我想要的东西就像linkedin.com页面。最简单的方法是什么？
继承人链接到我的导航栏的一个JSFiddle https://jsfiddle.net/b6pmy9w4/。预先感谢您的帮助。
HTML代码：

<nav class="navbar navbar-default" style="border-radius: 0;"> 
      <div class="container-fluid"> 
       <!-- Brand and toggle get grouped for better mobile display --> 
       <div class="navbar-header"> 
        <button type="button" class="navbar-toggle collapsed burger-button" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> 
         <span class="sr-only">Toggle navigation</span> 
         <span class="icon-bar"></span> 
         <span class="icon-bar"></span> 
         <span class="icon-bar"></span> 
        </button> 
        <a class="navbar-brand jura-font" href="/#!/">COLIGN</a> 
       </div> 
       <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> 
        <form class="navbar-form navbar-left" role="search"> 
         <div class="form-group"> 
          <input type="text" class="form-control" placeholder="Search"> 
         </div> 
         <!-- <button type="submit" class="btn btn-default">Submit</button> --> 
        </form> 
        <ul class="nav navbar-nav navbar-right"> 
         <li><a href="#"><span class="glyphicon glyphicon-comment"></span></a></li> 
         <li class="dropdown"> 
          <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><span class="glyphicon glyphicon-user"></span></a> 
          <ul class="dropdown-menu"> 
           <li><a href="#">View Profile</a></li> 
           <li><a href="#">Manage Account</a></li> 
           <li><a href="#">Invite a friend</a></li> 
           <li role="separator" class="divider"></li> 
           <li><a href="/auth/signout">Log out</a></li> 
          </ul> 
         </li> 
        </ul> 
       </div> 
       <!-- /.navbar-collapse --> 
      </div> 
      <!-- /.container-fluid --> 
     </nav> 

Answer 1

不知道这是做删除navbar-left

移动它的ul

集text-align:center

后的最佳方式，但

• Updated fiddle