diff --git a/diagrams/__init__.py b/diagrams/__init__.py
index 771f2a0a..4b73b2dc 100644
--- a/diagrams/__init__.py
+++ b/diagrams/__init__.py
@@ -77,16 +77,16 @@ class Diagram:
     # TODO: Label position option
     # TODO: Save directory option (filename + directory?)
     def __init__(
-            self,
-            name: str = "",
-            filename: str = "",
-            direction: str = "LR",
-            curvestyle: str = "ortho",
-            outformat: str = "png",
-            show: bool = True,
-            graph_attr: dict = {},
-            node_attr: dict = {},
-            edge_attr: dict = {},
+        self,
+        name: str = "",
+        filename: str = "",
+        direction: str = "LR",
+        curvestyle: str = "ortho",
+        outformat: str = "png",
+        show: bool = True,
+        graph_attr: dict = {},
+        node_attr: dict = {},
+        edge_attr: dict = {},
     ):
         """Diagram represents a global diagrams context.
 
@@ -208,10 +208,10 @@ class Cluster:
     #  Cluster direction does not work now. Graphviz couldn't render
     #  correctly for a subgraph that has a different rank direction.
     def __init__(
-            self,
-            label: str = "cluster",
-            direction: str = "LR",
-            graph_attr: dict = {},
+        self,
+        label: str = "cluster",
+        direction: str = "LR",
+        graph_attr: dict = {},
     ):
         """Cluster represents a cluster context.
 
@@ -427,14 +427,14 @@ class Edge:
     }
 
     def __init__(
-            self,
-            node: "Node" = None,
-            forward: bool = False,
-            reverse: bool = False,
-            label: str = "",
-            color: str = "",
-            style: str = "",
-            **attrs: Dict,
+        self,
+        node: "Node" = None,
+        forward: bool = False,
+        reverse: bool = False,
+        label: str = "",
+        color: str = "",
+        style: str = "",
+        **attrs: Dict,
     ):
         """Edge represents an edge between two nodes.