<!DOCTYPE html>
<html>
   <head>
      <title>Bootstrap Example</title>
      <meta name = "viewport" content = "width=device-width, initial-scale = 1">
      <link rel = "stylesheet" href = "https://stackpath.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://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </head>
   <body>
      <form role = "form">
         <div class = "form-group">
            <label for = "name">Country</label>
            <select multiple class = "form-control">
               <option>India</option>
               <option>Australia</option>
               <option>US</option>
            </select>
         </div>
      </form>
   </body>
</html>