i need to style this page using bootstrap but i can't get that
i need to style the tags with black border
and i need to add some margin to the top and the bottom of the container

<?php
require_once ("../templates/header.php");
 ?>
<?php
require_once ("../core/initialize.php");
?>

<div class="container" style="border: 1px dotted red;">
        <div class="row">
   <div class="panel panel-default">
      
    
     
           
           
<div class="panel-body">
 <form  method="post" id="exam-form" name="exam-form" action="submit_exam.php" class="form">

<?php
// Get questions from Database		
    //$question_type_id = 1 ;
     sleep(2);
    $question_type_id = Functions::GET("question_type_id");
    $question = $exam->find_question_for_exam(2);
    $total_of_questions = $question->rowCount();
    $question_rows = $question->fetchAll(PDO::FETCH_CLASS,"Exam");
    $question_number = 1 ;
    foreach ($question_rows as $question_row ):
    $question_id_array  [] =  $question_row->question_id;
    $_SESSION["question_id_array"] = $question_id_array;
		?>

		<div class="form-group col-lg-offset-1" style="border:2px dotted #000000">
		   
		   <div >  
		       <label class="">   <?php echo $question_number; ?> # </label>
		   </div>
		   
		   <div> 
		       <label><?php echo $question_row -> question_text; ?></label> 
		   </div>

	  
			     </div> 


		<?php $question_number++; ?>

		<?php
// Get answers from Database
$answer = $exam->find_answer_for_question($question_row->question_id);
$answer_rows = $answer->fetchAll(PDO::FETCH_CLASS,"Exam");

$answer_number = 1 ;
foreach ($answer_rows as $answer_row):
		?>
  
	<div >	
	       <ul class="col-lg-6">
				<li class="list-group-item" style="background-color: #EEE;">
					<strong> <?php echo $answer_number; ?>  - </strong>
<input type="radio" id="answer"  name="answer<?php echo $question_row -> question_id; ?>" value="<?php echo $answer_row -> answer_text; ?>" />
					<label><?php  echo $answer_row -> answer_text; ?></label>
				</li>
			</ul>
	</div>

		<?php $answer_number++; ?>

		<?php endforeach ; // End foreach for answers fetch ?>
		<?php endforeach ; // End foreach for questions fetch ?>
		<?php $_SESSION["total_of_questions"] = $total_of_questions; ?>
 
            <div class="col-lg-offset-11">
                
                     <button name="exam-submit-button" id="exam-submit-button" class="btn btn-lg btn-default form-group" >
                       
                    </button>

                
            </div>
           
            
   

	</form>
	        
        </div>
    </div>
    </div><!--row-->
</div> <!--container DIV-->
<?php //require_once ("../templates/footer.php"); ?>