Add a Gray Background Color to the Active Link

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Add a Gray Background Color to the Active Link

<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap Example</title>
      <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/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/3.3.7/js/bootstrap.min.js"></script>
   </head>
   <body>
      <nav class="navbar navbar-default">
         <div class="container-fluid">
            <div class="navbar-header">
               <a class="navbar-brand" href="#">Website</a>
            </div>
            <ul class="nav navbar-nav">
               <li class="active"><a href="#">Home</a></li>
               <li><a href="#">Tutorials</a></li>
               <li><a href="#">Articles</a></li>
            </ul>
         </div>
      </nav>
      <div class="container">
         <h3>Demo</h3>
         <p>This is Demo text.</p>
      </div>
   </body>
</html>

Output

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