我正在尝试使Bootstrap NavBar不在列表下方的行的顶部：
<body>
<!-- Navbar -->
<nav class="navbar calcite-navbar navbar-fixed-top calcite-text-light calcite-bg-dark">
</nav>
<!--/.calcite-navbar -->
<div class="container">
<div class="row">
<div id="leftPanel" class="col-sm-4">
<ul>
<li>item1</li>
<li>item2</li>
</ul>
</div>
<div id="mainPanel" class="col-sm-8">
</div>
</div>
</div>