diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 2f74d00e..699cbabd 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -2,10 +2,10 @@ name: tests
 
 on:
   push:
-    branches: [ main ]
+    branches: [main]
   pull_request:
   schedule:
-    - cron: '14 3 * * 1'  # at 03:14 on Monday.
+    - cron: "14 3 * * 1" # at 03:14 on Monday.
 
 jobs:
   pytest:
@@ -29,7 +29,7 @@ jobs:
         uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python-version }}
-          cache: 'poetry'
+          cache: "poetry"
       - name: Install package
         run: |
           poetry install --no-interaction
@@ -40,4 +40,4 @@ jobs:
       - uses: codecov/codecov-action@v2
         with:
           flags: fulltest
-          verbose: true
\ No newline at end of file
+          verbose: true
diff --git a/zndraw/app.py b/zndraw/app.py
index 1ec61d0e..30dd139c 100644
--- a/zndraw/app.py
+++ b/zndraw/app.py
@@ -131,7 +131,11 @@ def modifier_run(data):
     # modifier = available_methods[data["name"]](**data["params"])
     print(f"modifier:run {modifier = }")
     atoms_list = modifier.run(
-        atom_ids=data["selection"], atoms=atoms, points=points, segments=segments, json_data=data["atoms"] if "atoms" in data else None
+        atom_ids=data["selection"],
+        atoms=atoms,
+        points=points,
+        segments=segments,
+        json_data=data["atoms"] if "atoms" in data else None,
     )
     io.emit("atoms:clear", int(data["step"]) + 1)
     for idx, atoms in tqdm.tqdm(enumerate(atoms_list)):