Bootstrap为元素添加阴影

!DOCTYPE htmlhtmlheadtitleBootstrap Example/titlelink rel = stylesheet href = https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/boot

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<!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>

本文标题为:Bootstrap为元素添加阴影