我使用Twitter Bootstrap 3，当我想垂直对齐两个div时，我有问题，例如- JSFiddle链接:
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<div class="row">
<div class="col-xs-5">
<div style="height:5em;border:1px solid #000">Big</div>
</div>
<div class="col-xs-5">
<div style="height:3em;border:1px solid #F00">Small</div>
</div>
</div>
Bootstrap中的网格系统使用float: left，而不是display:inline-block，因此属性vertical-align不起作用。我尝试使用margin-top来修复它，但我认为这不是响应式设计的一个很好的解决方案。
这就是我的解。只需将这个类添加到您的CSS内容。
.align-middle {
display: flex;
justify-content: center;
align-items: center;
}
然后你的HTML看起来是这样的:
<div class="col-xs-12 align-middle">
<div class="col-xs-6" style="background-color:blue;">
<h3>Item</h3>
<h3>Item</h3>
</div>
<div class="col-xs-6" style="background-color:red;">
<h3>Item</h3>
</div>
</div>
.align-middle {
display: flex;
justify-content: center;
align-items: center;
}
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<!DOCTYPE html>
<title>Title</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-12 align-middle">
<div class="col-xs-6" style="background-color:blue;">
<h3>Item</h3>
<h3>Item</h3>
</div>
<div class="col-xs-6" style="background-color:red;">
<h3>Item</h3>
</div>
</div>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>
