我开始学习了Bootstrap4我有以下 html代码，
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<!-- Popper JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<!-- Latest compiled JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>
<style>
html, body{
height : 100%;
}
#contentwrapper{
width: 20%;
height: 100%;
padding-left: 10px;
}
</style>
</head>
<body>
<div id="contentwrapper" class="h-100 row align-items-center">
<nav class="navbar bg-dark navbar-dark" style="height: 100%;">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Item 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Item 2</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Item 3</a>
</li>
</ul>
</nav>
</div>
</body>
</html>我正在尝试获取元素 1、元素 2 和元素 3 nav-item到垂直顶部对齐 但它是垂直居中对齐
如何实现？
最佳答案
只需将 align-items-start ( https://getbootstrap.com/docs/4.3/utilities/flex/#align-items ) 添加到导航栏，因为它是一个 flexbox 容器:
html,
body {
height: 100%;
}
#contentwrapper {
width: 20%;
padding-left: 10px;
}<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<div id="contentwrapper" class="h-100 row ">
<nav class="navbar bg-dark navbar-dark h-100 align-items-start">
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" href="#">Item 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Item 2</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Item 3</a>
</li>
</ul>
</nav>
</div>关于html - 将导航栏中的内容对齐到顶部，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57028276/