我有这个Twitter Bootstrap代码

  <div class='navbar navbar-fixed-top'>
    <div class='navbar-inner'>
      <div class='container'>
        <a class='btn btn-navbar' data-target='.nav-collapse' data-toggle='collapse'>
          <span class='icon-bar'></span>
          <span class='icon-bar'></span>
          <span class='icon-bar'></span>
        </a>
        <div class='nav-collapse'>
          <ul class='nav'>
            <li class='active'>
              <a href='some_url'>My Home</a>
            </li>
            <li>
              <a href='some_url'>Option 1 </a>
            </li>
            <li>
              <a href='some_url'>Another option</a>
            </li>
            <li>
              <a href='some_url'>Another option</a>
            </li>
          </ul>
        </div>
      </div>
    </div>
  </div>

但是，当我查看页面的开头时，导航栏阻止了页面顶部附近的某些内容。关于如何使它在查看页面顶部时将其其余内容压低的想法，以便使内容不会被导航栏阻止？