CSS external links not supporting while generate PDF file

Question

Hi,

 

I have generated the PDF file using iTextSharp but CSS format is not applied on report file.

 

MyCode:

 

The format I expect:

 

 

But It shows,

 

 

Files not loaded:

 

<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>

 

Please help me