我正在尝试使用 d-flex align-items-start 将导航栏顶部的导航项对齐，但是它不起作用，并且显示导航栏的中心，我该怎么做呢？请帮助我
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<body>
<div class="wrapper">
<nav class="navbar navbar-expand-sm navbar-light admin-header fixed-top">
<a class="navbar-brand" href="#"><img src="images/karvy-logo.png" class="img-fluid logo"></a>
<ul class="navbar-nav bg-primary d-flex align-items-start">
<li class="nav-item">
<a class="nav-link " href="#">Home</a>
</li>
</ul>
</nav>
</div>
</body>