diff --git a/cozy/ui/book_detail_view.py b/cozy/ui/book_detail_view.py
index b502aa18..6ef8e0be 100644
--- a/cozy/ui/book_detail_view.py
+++ b/cozy/ui/book_detail_view.py
@@ -1,19 +1,20 @@
 import logging
 import time
+from math import pi as PI
 from threading import Event, Thread
 from typing import Callable, Final
-from math import pi as PI
 
-from gi.repository import Adw, GLib, Gtk, GObject, Gdk, Graphene, Gsk, Gio
 import cairo
+from gi.repository import Adw, Gio, GLib, GObject, Graphene, Gtk
+
 from cozy.control.artwork_cache import ArtworkCache
 from cozy.ext import inject
 from cozy.model.book import Book
 from cozy.model.chapter import Chapter
 from cozy.report import reporter
 from cozy.ui.chapter_element import ChapterElement
-from cozy.view_model.book_detail_view_model import BookDetailViewModel
 from cozy.ui.toaster import ToastNotifier
+from cozy.view_model.book_detail_view_model import BookDetailViewModel
 
 log = logging.getLogger(__name__)
 
@@ -303,7 +304,9 @@ def _display_external_section(self):
 
         if external:
             self.available_offline_action.handler_block_by_func(self._download_switch_changed)
-            self.available_offline_action.set_state(GLib.Variant.new_boolean(self._view_model.book.offline))
+            self.available_offline_action.set_state(
+                GLib.Variant.new_boolean(self._view_model.book.offline)
+            )
             self.available_offline_action.handler_unblock_by_func(self._download_switch_changed)
 
     def _set_cover_image(self, book: Book):
diff --git a/cozy/view_model/book_detail_view_model.py b/cozy/view_model/book_detail_view_model.py
index e5313123..81d229dd 100644
--- a/cozy/view_model/book_detail_view_model.py
+++ b/cozy/view_model/book_detail_view_model.py
@@ -189,7 +189,12 @@ def _on_playback_speed_changed(self):
         self._notify("length")
 
     def _on_offline_cache_event(self, event, message) -> None:
-        if self._book and isinstance(message, Book) and self._book.id == message.id and event in {"book-offline-removed", "book-offline"}:
+        if (
+            self._book
+            and isinstance(message, Book)
+            and self._book.id == message.id
+            and event in {"book-offline-removed", "book-offline"}
+        ):
             self._notify("downloaded")
 
     def _on_app_setting_changed(self, event, _):