This is the header, located here: /Users/david/PycharmProjects/CheeseCake87-Repos/flask-imp/example/app/self_reg/templates/self_reg/includes/header.html
It's being imported in the /Users/david/PycharmProjects/CheeseCake87-Repos/flask-imp/example/app/self_reg/templates/self_reg/extends/main.html
template.