Bootstrap为元素添加阴影

<!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>
Bootstrap为元素添加阴影

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