diff --git a/schilder2000/helpers.py b/schilder2000/helpers.py
index cba4a604996adb5c60cb2a627fe3fc6ed5c896eb..b7be6615d617a29744418c96b8af8ad33c7f0df0 100644
--- a/schilder2000/helpers.py
+++ b/schilder2000/helpers.py
@@ -30,12 +30,16 @@ class Blueprint(FlaskBlueprint):
 
 class Flask(_Flask):
     def create_global_jinja_loader(self) -> BaseLoader:
-        return ChoiceLoader([
-            PrefixLoader({}, delimiter=":"),
-            self.jinja_loader,
-        ])
+        return ChoiceLoader(
+            [
+                PrefixLoader({}, delimiter=":"),
+                self.jinja_loader,
+            ]
+        )
 
     def register_blueprint(self, blueprint: Blueprint, **options: t.Any) -> None:
         super().register_blueprint(blueprint, **options)
         if blueprint.jinja_loader is not None:
-            self.jinja_env.loader.loaders[0].mapping[blueprint.name] = blueprint.jinja_loader
+            self.jinja_env.loader.loaders[0].mapping[blueprint.name] = (
+                blueprint.jinja_loader
+            )
diff --git a/schilder2000/instance.py b/schilder2000/instance.py
index 5f77d66bd164da2fd5e3ecf6a8f48d6a10221020..f74d22e9ad6bf054c7161037fff184a38b8723d5 100644
--- a/schilder2000/instance.py
+++ b/schilder2000/instance.py
@@ -22,6 +22,6 @@ def schild_html(ident):
     return bp.render_template(schild.template, schild=schild)
 
 
-@bp.route('/schild/<ident>.pdf')
+@bp.route("/schild/<ident>.pdf")
 def schild_pdf(ident):
-    return render_pdf(url_for('.schild_html', ident=ident))
+    return render_pdf(url_for(".schild_html", ident=ident))
diff --git a/schilder2000/views.py b/schilder2000/views.py
index 9d6e43e9c3144d4cfe8947cafe5e378ee0eabe8e..9738086a26c22d40fd55b161b5d5d7da9b8938ee 100644
--- a/schilder2000/views.py
+++ b/schilder2000/views.py
@@ -1,9 +1,7 @@
 from . import db
 from .models import Schild
 
-from flask import (
-    Blueprint, render_template, request, redirect, url_for
-)
+from flask import Blueprint, render_template, request, redirect, url_for
 
 from flask_wtf import FlaskForm