Añado static a urls.py

JugarAlPadel/gestion_reservas/gestion_reservas/urls.py

@@ -32,3 +32,5 @@ urlpatterns = [
     path("", TemplateView.as_view(template_name="index.html"),
          name="principal"),  # new
 ] + static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
+
+urlpatterns += static(settings.STATIC_URL, document_root=settings.STATIC_ROOT)