Use ANY_JS to include css.

biscuit/core/settings.py

@@ -257,6 +257,7 @@ ANY_JS = {
         "css_url": JS_URL + "/datatables/media/css/dataTables.bootstrap4.min.css",
         "js_url": JS_URL + "/datatables/media/js/dataTables.bootstrap4.min.js",
     },
+    "material-design-icons": STATIC_URL + "@mdi/font/css/materialdesignicons.css",
 }
 
 SASS_PROCESSOR_AUTO_INCLUDE = False

biscuit/core/templates/core/base.html

@@ -6,10 +6,10 @@
 
 {% block bootstrap4_extra_head %}
   {% include_css "DataTables-Bootstrap4" %}
+  {% include_css "material-design-icons"%}
   {% include 'core/icons.html' %}
   <link rel="stylesheet" href="{% sass_src 'bootstrap_modified.scss' %}" />
   <link rel="stylesheet" href="{% static 'css/style.css' %}" />
-  <link rel="stylesheet" href="{% static '@mdi/font/css/materialdesignicons.css' %}" />
 {% endblock %}
 
 {% block bootstrap4_title %}BiscuIT School Information System{% endblock %}