diff --git a/src/__init__.py b/src/__init__.py
index af8ed11..9d1839e 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -8,8 +8,9 @@ from aqt.webview import AnkiWebView
 
 config = mw.addonManager.getConfig(__name__)
 
+
 class EditorPreview(object):
-    js=[
+    js = [
         "js/mathjax.js",
         "js/vendor/mathjax/tex-chtml.js",
         "js/reviewer.js",
@@ -18,7 +19,7 @@ class EditorPreview(object):
     def __init__(self):
         gui_hooks.editor_did_init.append(self.editor_init_hook)
         gui_hooks.editor_did_init_buttons.append(self.editor_init_button_hook)
-        if int(buildinfo.version.split(".")[2]) < 45: # < 2.1.45
+        if int(buildinfo.version.split(".")[2]) < 45:  # < 2.1.45
             self.js = [
                 "js/vendor/jquery.min.js",
                 "js/vendor/css_browser_selector.min.js",
@@ -27,7 +28,6 @@ class EditorPreview(object):
                 "js/reviewer.js",
             ]
 
-
     def editor_init_hook(self, ed: editor.Editor):
         ed.editor_preview = AnkiWebView(title="editor_preview")
         # This is taken out of clayout.py
@@ -38,34 +38,36 @@ class EditorPreview(object):
             context=ed,
         )
 
-        if not config['showPreviewAutomatically']:
+        if not config["showPreviewAutomatically"]:
             ed.editor_preview.hide()
 
         self._inject_splitter(ed)
         gui_hooks.editor_did_fire_typing_timer.append(lambda o: self.onedit_hook(ed, o))
-        gui_hooks.editor_did_load_note.append(lambda o: None if o != ed else self.editor_note_hook(o))
+        gui_hooks.editor_did_load_note.append(
+            lambda o: None if o != ed else self.editor_note_hook(o)
+        )
 
     def _get_splitter(self, editor):
         layout = editor.outerLayout
-        mainR, editorR = [int(r) for r in config['splitRatio'].split(":")]
-        location = config['location']
+        mainR, editorR = [int(r) for r in config["splitRatio"].split(":")]
+        location = config["location"]
         split = QSplitter()
-        if location == 'above':
+        if location == "above":
             split.setOrientation(Qt.Vertical)
             split.addWidget(editor.editor_preview)
             split.addWidget(editor.web)
             sizes = [editorR, mainR]
-        elif location ==  'below':
+        elif location == "below":
             split.setOrientation(Qt.Vertical)
             split.addWidget(editor.web)
             split.addWidget(editor.editor_preview)
             sizes = [mainR, editorR]
-        elif location == 'left':
+        elif location == "left":
             split.setOrientation(Qt.Horizontal)
             split.addWidget(editor.editor_preview)
             split.addWidget(editor.web)
             sizes = [editorR, mainR]
-        elif location == 'right':
+        elif location == "right":
             split.setOrientation(Qt.Horizontal)
             split.addWidget(editor.web)
             split.addWidget(editor.editor_preview)
@@ -76,7 +78,6 @@ class EditorPreview(object):
         split.setSizes(sizes)
         return split
 
-
     def _inject_splitter(self, editor: editor.Editor):
         layout = editor.outerLayout
         web_index = layout.indexOf(editor.web)
@@ -85,16 +86,19 @@ class EditorPreview(object):
         split = self._get_splitter(editor)
         layout.insertWidget(web_index, split)
 
-
     def editor_note_hook(self, editor):
         self.onedit_hook(editor, editor.note)
 
     def editor_init_button_hook(self, buttons, editor):
         addon_path = os.path.dirname(__file__)
-        icons_dir = os.path.join(addon_path, 'icons')
-        b = editor.addButton(icon=os.path.join(icons_dir, 'file.svg'), cmd="_editor_toggle_preview", tip='Toggle Live Preview',
-                    func=lambda o=editor: self.onEditorPreviewButton(o), disables=False
-             )
+        icons_dir = os.path.join(addon_path, "icons")
+        b = editor.addButton(
+            icon=os.path.join(icons_dir, "file.svg"),
+            cmd="_editor_toggle_preview",
+            tip="Toggle Live Preview",
+            func=lambda o=editor: self.onEditorPreviewButton(o),
+            disables=False,
+        )
         buttons.append(b)
 
     def onEditorPreviewButton(self, origin: editor.Editor):
@@ -103,13 +107,14 @@ class EditorPreview(object):
         else:
             origin.editor_preview.hide()
 
-
     def _obtainCardText(self, note):
         c = note.ephemeral_card()
         a = mw.prepare_card_text_for_display(c.answer())
         a = gui_hooks.card_will_show(a, c, "clayoutAnswer")
         if theme_manager.night_mode:
-            bodyclass = theme_manager.body_classes_for_card_ord(c.ord, mw.pm.night_mode())
+            bodyclass = theme_manager.body_classes_for_card_ord(
+                c.ord, mw.pm.night_mode()
+            )
         else:
             bodyclass = theme_manager.body_classes_for_card_ord(c.ord)
         bodyclass += " editor-preview"
@@ -120,4 +125,5 @@ class EditorPreview(object):
         if editor.note == origin:
             editor.editor_preview.eval(self._obtainCardText(editor.note))
 
+
 eprev = EditorPreview()