Bootstrap下拉到100％

Question

我是网站设计的新手，遇到了一个我似乎无法找到解决方案的问题。我创建一个网站和我想要的下拉菜单居中，并跨越100％的屏幕。我有菜单工作，但是当我点击下拉菜单时，切换按钮也会跨越到与实际下拉菜单相同的宽度，导致所有其他导航元素被推到右侧。

当您点击导航栏中的下拉菜单时，您可以在

http://cheekylildevils.co.uk看到我的意思。

提前致谢

<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="navbar-header">
    <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
     <span class="icon-bar"></span>
     <span class="icon-bar"></span>
     <span class="icon-bar"></span>
    </button>
  </div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
  <li class="active"><a href="#">Home</a></li>
      <ul class="nav nav-pills">
            <li class="dropdown">
              <a href="#" data-toggle="dropdown" class="dropdown-toggle">About Us <b class="caret"></b></a>
                  <ul class="dropdown-menu" id="menu1">
                        <li class="dropdown-submenu">
                          <a href="#">More options</a>
                          <a href="#">More options</a>
                          <a href="#">More options</a>
                          <a href="#">More options</a>
                          <a href="#">More options</a>
                          <a href="#">More options</a>
                        </li>
                  </ul>
            </li>
     </ul>
    <li><a href="#">Key Info</a></li>
    <li><a href="#">Learning</a></li>
    <li><a href="#">Children</a></li>
    <li><a href="#">News</a></li>
    <li><a href="#">Gallery</a></li>
    <li><a href="#">Contact Us</a></li>
</ul> 
</div>
</nav>

的CSS：

.nav {
    display: inline-block;
}
.navbar-header {
    float: none;
}
.navbar-left,.navbar-right {
    float: none !important;
}
.navbar-toggle {
    display: block;
}
.navbar .navbar-nav {
    display: inline-block;
    float: none;
    vertical-align: top;
}
.navbar-collapse {
    border-top: 1px solid transparent;
    box-shadow: inset 0 1px 0 rgba(255,255,255,0.1);
    text-align: center;
}
.navbar-fixed-top {
    top: 0;
    border-width: 0 0 1px;
}
.nav-pills>li {
    float: none;
}
.nav-pills>li>a {
    color: #fff;
}
.nav-pills>li>a:hover {
    background: none;
}
.nav .open>a, .nav .open>a:hover {
    background: none!important;
    border: none!important;
}
.navbar-collapse.collapse {
    display: none!important;
    background-color: rgba(3, 3, 3, 0.63);      
}
.navbar-nav {
    float: none!important;
    margin-top: 0px;
    width: 60%;
    margin: 0 auto;
}
.navbar-nav>li {
    text-align: center;
    display: inline-block;
    float: none;
}
.navbar-nav>li>a {
    padding-top: 10px;
    padding-bottom: 10px;
}
.collapse.in{
    display:block !important;
}
.navbar-inverse {
    background-color: #c31f40;
    border-color: #d82a4d;
}
.open>.dropdown-menu {
    display: inline-block;
    width: 100%;
    position: static;
    background: none;
    color: #fff;
}
.dropdown-menu>li>a {
    color: #fff;
    display: inline-block;
}