编程学习网为您整理以下代码实例，主要实现：Bootstrap为元素添加阴影，希望可以帮到各位朋友。
<!DOCTYPE HTML>
<HTML>
<head>
<Title>bootstrap Example</Title>
<link rel = "stylesheet" href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/CSS/bootstrap.min.CSS">
<script src = "https://AJAX.GoogleAPIs.com/AJAX/libs/jquery/3.3.1/jquery.min.Js"></script>
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/Js/bootstrap.min.Js"></script>
</head>
<body>
<div class = "container">
<h1>Learning</h1>
<div class="shadow-lg p-4 mb-4 bg-light">Try programming examples</div>
<div class="shadow-sm p-4 mb-4 bg-light">Try programming examples</div>
<div class="shadow-none p-4 mb-4 bg-light">Play Quiz and check your kNowledge</div>
</div>
</body>
</HTML>
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