specified base.html path

widget_princessgabi/assignments/templates/assignments/assignment-add.html

-{% extends 'base.html' %}
+{% extends 'templates/base.html' %}
 {% load static %}
 {% block stylesheets %}
 <link rel="stylesheet" type="text/css" href="{% static 'stylesheets/forms.css' %}">

widget_princessgabi/assignments/templates/assignments/assignment-details.html

-{% extends 'base.html' %}
+{% extends 'templates/base.html' %}
 {% load static %}
 {% block stylesheets %}
 <link rel="stylesheet" type="text/css" href="{% static 'assignments/assignments.css' %}">

widget_princessgabi/assignments/templates/assignments/assignment-edit.html

-{% extends 'base.html' %}
+{% extends 'templates/base.html' %}
 {% load static %}
 {% block stylesheets %}
 <link rel="stylesheet" type="text/css" href="{% static 'stylesheets/forms.css' %}">

widget_princessgabi/assignments/templates/assignments/assignments.html

-{% extends 'base.html' %}
+{% extends 'templates/base.html' %}
 {% load static %}
 {% block stylesheets %}
 <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">