I built my backend using Python Flask and tested it with basic HTML templates with no CSS and it worked no problem. However, when I tried to implement Bootstrap it won't load the css. I've placed the css and js files into a static folder.
Here is the Bootstrap HTML markup:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags --> <meta name="description" content=""> <meta name="author" content=""> <link rel="icon" href="../../favicon.ico"> <title>Simple Safety</title> <!-- Bootstrap core CSS --> <link href="{{ url_for('static', filename ='bootstrap.min.css') }}" rel="stylesheet"> <!-- IE10 viewport hack for Surface/desktop Windows 8 bug --> <link href="{{ url_for('static', filename =ie10-viewport-bug-workaround.css') }}" rel="stylesheet"> <!-- Custom styles for this template --> <link href="{{ url_for('static', filename ='style.css') }}" rel="stylesheet"> <!-- Just for debugging purposes. Don't actually copy these 2 lines! --> <!--[if lt IE 9]><script src="../../assets/js/ie8-responsive-file-warning.js"></script><![endif] <script type="text/javascript" src="{{ url_for('static', filename = 'ie-emulation-modes-warning.js') }}"></script>--> <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries --> <!--[if lt IE 9]> <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"> </script> <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"> </script> <![endif]--> </head> <!--Main Content--> <!-- Bootstrap core JavaScript ================================================== --> <!-- Placed at the end of the document so the pages load faster --> <script src="{{url_for('https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/', filename='jquery.min.js') }}"></script> <script>window.jQuery || document.write("<script type='text/javascript' src='{{ url_for('static', filename='jquery.min.js') }}''><\/script>")</script> <script type="text/javascript" src="{{ url_for('static', filename ='bootstrap.min.js') }}"></script> <!-- IE10 viewport hack for Surface/desktop Windows 8 bug --> <script type="text/javascript" src="{{ url_for('static', filename='ie10-viewport-bug-workaround.js') }}"></script> </body> </html> 