diff --git a/alfort/app.py b/alfort/app.py
index 07d0bac..0e05683 100644
--- a/alfort/app.py
+++ b/alfort/app.py
@@ -112,12 +112,10 @@ def __init__(
     @abstractmethod
     def create_element(
         self, tag: str, props: Props, children: list[N], dispatch: Dispatch[M]
-    ) -> N:
-        ...
+    ) -> N: ...
 
     @abstractmethod
-    def create_text(self, text: str, dispatch: Dispatch[M]) -> N:
-        ...
+    def create_text(self, text: str, dispatch: Dispatch[M]) -> N: ...
 
     def _patch_children(
         self,
diff --git a/alfort/vdom.py b/alfort/vdom.py
index 8c12b87..a2bda52 100644
--- a/alfort/vdom.py
+++ b/alfort/vdom.py
@@ -32,8 +32,7 @@ class PatchText:
 
 
 class Node(Protocol):
-    def apply(self, patch: Patch) -> None:
-        ...
+    def apply(self, patch: Patch) -> None: ...
 
 
 @dataclass(slots=True, frozen=True)
@@ -44,8 +43,7 @@ class Element(Generic[T]):
 
 
 @dataclass(slots=True, frozen=True)
-class VDomElement(Element["VDom"]):
-    ...
+class VDomElement(Element["VDom"]): ...
 
 
 VDom = VDomElement | str