在Bootstrap 4卡中的任何标题元素上添加标题
要将标题添加到Bootstrap卡中的任何标题元素，请使用card-title类-
<h4 class="card-title"> Top Universities </h4>
卡标题类位于Bootstrap的卡类内部-
<div class="card-body"> <h4 class="card-title">Top Universities</h4> <p class="card-text">Stanford</p> <p class="card-text">Oxford</p> </div>
示例
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<div class="card">
<div class="card-body">
<h4 class="card-title">Top Universities</h4>
<p class="card-text">Stanford</p>
<p class="card-text">Oxford</p>
</div>
</div>
</div>
</body>
</html>