diff --git a/PyPDFForm/core/patterns.py b/PyPDFForm/core/patterns.py
index c8ad3809..9570149d 100644
--- a/PyPDFForm/core/patterns.py
+++ b/PyPDFForm/core/patterns.py
@@ -5,13 +5,14 @@
 from ..middleware.dropdown import Dropdown
 from ..middleware.radio import Radio
 from ..middleware.text import Text
-from .constants import (ANNOTATION_FIELD_KEY, CHOICE_FIELD_IDENTIFIER,
+from .constants import (ANNOTATION_FIELD_KEY, BUTTON_IDENTIFIER,
+                        BUTTON_STYLE_IDENTIFIER, CHOICE_FIELD_IDENTIFIER,
                         CHOICES_IDENTIFIER, FIELD_FLAG_KEY, PARENT_KEY,
                         SELECTABLE_IDENTIFIER, SUBTYPE_KEY,
                         TEXT_FIELD_ALIGNMENT_IDENTIFIER,
                         TEXT_FIELD_APPEARANCE_IDENTIFIER,
                         TEXT_FIELD_IDENTIFIER, WIDGET_SUBTYPE_KEY,
-                        WIDGET_TYPE_KEY, BUTTON_STYLE_IDENTIFIER, BUTTON_IDENTIFIER)
+                        WIDGET_TYPE_KEY)
 
 WIDGET_TYPE_PATTERNS = [
     (
@@ -74,5 +75,5 @@
 
 BUTTON_STYLE_PATTERNS = [
     {BUTTON_IDENTIFIER: {BUTTON_STYLE_IDENTIFIER: True}},
-    {PARENT_KEY: {BUTTON_IDENTIFIER: {BUTTON_STYLE_IDENTIFIER: True}}}
+    {PARENT_KEY: {BUTTON_IDENTIFIER: {BUTTON_STYLE_IDENTIFIER: True}}},
 ]
diff --git a/PyPDFForm/core/template.py b/PyPDFForm/core/template.py
index f01598be..42bd6b83 100644
--- a/PyPDFForm/core/template.py
+++ b/PyPDFForm/core/template.py
@@ -10,9 +10,9 @@
 from ..middleware.text import Text
 from .constants import (ANNOTATION_RECTANGLE_KEY, COMB, MULTILINE,
                         NEW_LINE_SYMBOL, TEXT_FIELD_MAX_LENGTH_KEY)
-from .patterns import (DROPDOWN_CHOICE_PATTERNS, TEXT_FIELD_FLAG_PATTERNS,
-                       WIDGET_ALIGNMENT_PATTERNS, WIDGET_KEY_PATTERNS,
-                       WIDGET_TYPE_PATTERNS, BUTTON_STYLE_PATTERNS)
+from .patterns import (BUTTON_STYLE_PATTERNS, DROPDOWN_CHOICE_PATTERNS,
+                       TEXT_FIELD_FLAG_PATTERNS, WIDGET_ALIGNMENT_PATTERNS,
+                       WIDGET_KEY_PATTERNS, WIDGET_TYPE_PATTERNS)
 from .utils import find_pattern_match, stream_to_io, traverse_pattern
 
 
diff --git a/PyPDFForm/core/utils.py b/PyPDFForm/core/utils.py
index 8d65bef7..5179be5d 100644
--- a/PyPDFForm/core/utils.py
+++ b/PyPDFForm/core/utils.py
@@ -11,8 +11,9 @@
 from ..middleware.constants import WIDGET_TYPES
 from ..middleware.radio import Radio
 from ..middleware.text import Text
-from .constants import (DEFAULT_CHECKBOX_STYLE, BUTTON_STYLES, DEFAULT_FONT, DEFAULT_FONT_COLOR,
-                        DEFAULT_FONT_SIZE, PREVIEW_FONT_COLOR, DEFAULT_RADIO_STYLE)
+from .constants import (BUTTON_STYLES, DEFAULT_CHECKBOX_STYLE, DEFAULT_FONT,
+                        DEFAULT_FONT_COLOR, DEFAULT_FONT_SIZE,
+                        DEFAULT_RADIO_STYLE, PREVIEW_FONT_COLOR)
 
 
 def stream_to_io(stream: bytes) -> BinaryIO:
diff --git a/PyPDFForm/middleware/template.py b/PyPDFForm/middleware/template.py
index c6173dc0..b39ac711 100644
--- a/PyPDFForm/middleware/template.py
+++ b/PyPDFForm/middleware/template.py
@@ -3,12 +3,12 @@
 
 from typing import Dict
 
-from ..core.template import (construct_widget, get_character_x_paddings,
-                             get_dropdown_choices, get_text_field_max_length,
-                             get_widget_key, get_widgets_by_page,
-                             is_text_field_comb, get_button_style)
-from .constants import WIDGET_TYPES
+from ..core.template import (construct_widget, get_button_style,
+                             get_character_x_paddings, get_dropdown_choices,
+                             get_text_field_max_length, get_widget_key,
+                             get_widgets_by_page, is_text_field_comb)
 from .checkbox import Checkbox
+from .constants import WIDGET_TYPES
 from .dropdown import Dropdown
 from .radio import Radio
 from .text import Text
diff --git a/tests/test_create_widget.py b/tests/test_create_widget.py
index 06c40ba9..f19b18b4 100644
--- a/tests/test_create_widget.py
+++ b/tests/test_create_widget.py
@@ -82,9 +82,7 @@ def test_create_checkbox_complex(template_stream, pdf_samples, request):
 
 
 def test_create_checkbox_check(template_stream, pdf_samples, request):
-    expected_path = os.path.join(
-        pdf_samples, "widget", "create_checkbox_check.pdf"
-    )
+    expected_path = os.path.join(pdf_samples, "widget", "create_checkbox_check.pdf")
     with open(expected_path, "rb+") as f:
         obj = PdfWrapper(template_stream).create_widget(
             "checkbox",
@@ -106,9 +104,7 @@ def test_create_checkbox_check(template_stream, pdf_samples, request):
 
 
 def test_create_checkbox_circle(template_stream, pdf_samples, request):
-    expected_path = os.path.join(
-        pdf_samples, "widget", "create_checkbox_circle.pdf"
-    )
+    expected_path = os.path.join(pdf_samples, "widget", "create_checkbox_circle.pdf")
     with open(expected_path, "rb+") as f:
         obj = PdfWrapper(template_stream).create_widget(
             "checkbox",
@@ -130,9 +126,7 @@ def test_create_checkbox_circle(template_stream, pdf_samples, request):
 
 
 def test_create_checkbox_cross(template_stream, pdf_samples, request):
-    expected_path = os.path.join(
-        pdf_samples, "widget", "create_checkbox_cross.pdf"
-    )
+    expected_path = os.path.join(pdf_samples, "widget", "create_checkbox_cross.pdf")
     with open(expected_path, "rb+") as f:
         obj = PdfWrapper(template_stream).create_widget(
             "checkbox",