我在引导程序中有一个下拉菜单,但我不知道如何将我在其中的表格居中。
这是我的代码;
<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</a>
<a class="brand" href="#">Testing, 123</a>
<div class="nav-collapse">
<ul class="nav">
<li class="active"><a href="#"><i class="icon-home icon-white"></i> Home</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
<div class="dropdown-menu">
<form accept-charset="UTF-8" action="/sessions" method="post">
<fieldset class='textbox login'>
<label id='js-username'>
<span>Username</span>
<input autocomplete="on" id="username" name="username" type="text" size="20px"/>
</label>
<label id='password'>
<span>Password</span>
<input id="userpassword" name="userpassword" type="password" />
</label>
</fieldset>
<fieldset class='subchk'>
<input name="commit" type="submit" value="Log In" />
</fieldset>
</form>
</div>
</li>
</ul>
<form class="navbar-search pull-right" action="">
<input type="text" class="search-query span2" placeholder="Search">
</form>
</div><!-- /.nav-collapse -->
</div><!-- /.container -->
</div><!-- /.navbar-inner -->
</div><!-- /.navbar -->
我已经调整了 CSS 中下拉菜单的宽度以适合我的表单,但我无法弄清楚如何在下拉菜单中将表单居中。