diff --git a/zndraw/app.py b/zndraw/app.py
index 5dca74f3d..6f6357433 100644
--- a/zndraw/app.py
+++ b/zndraw/app.py
@@ -430,6 +430,7 @@ def download_request(data):
 def download_response(data):
     emit("download:response", data["data"], to=data["sid"])
 
+
 @io.on("scene:play")
 def scene_play(data):
     print(f"scene:play {data}")
@@ -438,6 +439,7 @@ def scene_play(data):
     else:
         emit("scene:play", to=session["token"])
 
+
 @io.on("scene:pause")
 def scene_pause(data):
     print(f"scene:pause {data}")
diff --git a/zndraw/zndraw.py b/zndraw/zndraw.py
index 502fbbb26..748a31b7b 100644
--- a/zndraw/zndraw.py
+++ b/zndraw/zndraw.py
@@ -204,10 +204,14 @@ def selection(self, value: list[int]):
         self.socket.emit("selection:set", data)
 
     def play(self):
-        self.socket.emit("scene:play", {"sid": self._target_sid if self._target_sid else self.token})
+        self.socket.emit(
+            "scene:play", {"sid": self._target_sid if self._target_sid else self.token}
+        )
 
     def pause(self):
-        self.socket.emit("scene:pause", {"sid": self._target_sid if self._target_sid else self.token})
+        self.socket.emit(
+            "scene:pause", {"sid": self._target_sid if self._target_sid else self.token}
+        )
 
 
 @dataclasses.dataclass
@@ -326,14 +330,16 @@ def modifier_run(self, data):
 
             size = len(self)
 
-            for idx, atoms in enumerate(modifier.run(
-                atom_ids=selection,
-                atoms=atoms,
-                points=points,
-                segments=segments,
-                json_data=json_data,
-                url=data["url"],
-            )):
+            for idx, atoms in enumerate(
+                modifier.run(
+                    atom_ids=selection,
+                    atoms=atoms,
+                    points=points,
+                    segments=segments,
+                    json_data=json_data,
+                    url=data["url"],
+                )
+            ):
                 self[size + idx] = atoms
             self.play()