diff --git a/calc.py b/calc.py
index 758bc87..236f70b 100644
--- a/calc.py
+++ b/calc.py
@@ -1,15 +1,22 @@
 import tkinter as tk
+from dataclasses import dataclass
 
-LARGE_FONT_STYLE = ("Arial", 40, "bold")
-SMALL_FONT_STYLE = ("Arial", 16)
-DIGITS_FONT_STYLE = ("Arial", 24, "bold")
-DEFAULT_FONT_STYLE = ("Arial", 20)
 
-OFF_WHITE = "#F8FAFF"
-WHITE = "#FFFFFF"
-LIGHT_BLUE = "#CCEDFF"
-LIGHT_GRAY = "#F5F5F5"
-LABEL_COLOR = "#25265E"
+@dataclass
+class Fonts:
+    LARGE_FONT_STYLE = ("Arial", 40, "bold")
+    SMALL_FONT_STYLE = ("Arial", 16)
+    DIGITS_FONT_STYLE = ("Arial", 24, "bold")
+    DEFAULT_FONT_STYLE = ("Arial", 20)
+
+
+@dataclass
+class Colors:
+    OFF_WHITE = "#F8FAFF"
+    WHITE = "#FFFFFF"
+    LIGHT_BLUE = "#CCEDFF"
+    LIGHT_GRAY = "#F5F5F5"
+    LABEL_COLOR = "#25265E"
 
 
 class Calculator:
@@ -46,10 +53,16 @@ def __init__(self):
     def bind_keys(self):
         self.window.bind("<Return>", lambda event: self.evaluate())
         for key in self.digits:
-            self.window.bind(str(key), lambda event, digit=key: self.add_to_expression(digit))
+            self.window.bind(
+                str(key),
+                lambda event,
+                digit=key: self.add_to_expression(digit))
 
         for key in self.operations:
-            self.window.bind(key, lambda event, operator=key: self.append_operator(operator))
+            self.window.bind(
+                key,
+                lambda event,
+                operator=key: self.append_operator(operator))
 
     def create_special_buttons(self):
         self.create_clear_button()
@@ -58,18 +71,30 @@ def create_special_buttons(self):
         self.create_sqrt_button()
 
     def create_display_labels(self):
-        total_label = tk.Label(self.display_frame, text=self.total_expression, anchor=tk.E, bg=LIGHT_GRAY,
-                               fg=LABEL_COLOR, padx=24, font=SMALL_FONT_STYLE)
+        total_label = tk.Label(
+            self.display_frame,
+            text=self.total_expression,
+            anchor=tk.E,
+            bg=Colors.LIGHT_GRAY,
+            fg=Colors.LABEL_COLOR,
+            padx=24,
+            font=Fonts.SMALL_FONT_STYLE)
         total_label.pack(expand=True, fill='both')
 
-        label = tk.Label(self.display_frame, text=self.current_expression, anchor=tk.E, bg=LIGHT_GRAY,
-                         fg=LABEL_COLOR, padx=24, font=LARGE_FONT_STYLE)
+        label = tk.Label(
+            self.display_frame,
+            text=self.current_expression,
+            anchor=tk.E,
+            bg=Colors.LIGHT_GRAY,
+            fg=Colors.LABEL_COLOR,
+            padx=24,
+            font=Fonts.LARGE_FONT_STYLE)
         label.pack(expand=True, fill='both')
 
         return total_label, label
 
     def create_display_frame(self):
-        frame = tk.Frame(self.window, height=221, bg=LIGHT_GRAY)
+        frame = tk.Frame(self.window, height=221, bg=Colors.LIGHT_GRAY)
         frame.pack(expand=True, fill="both")
         return frame
 
@@ -79,9 +104,18 @@ def add_to_expression(self, value):
 
     def create_digit_buttons(self):
         for digit, grid_value in self.digits.items():
-            button = tk.Button(self.buttons_frame, text=str(digit), bg=WHITE, fg=LABEL_COLOR, font=DIGITS_FONT_STYLE,
-                               borderwidth=0, command=lambda x=digit: self.add_to_expression(x))
-            button.grid(row=grid_value[0], column=grid_value[1], sticky=tk.NSEW)
+            button = tk.Button(
+                self.buttons_frame,
+                text=str(digit),
+                bg=Colors.WHITE,
+                fg=Colors.LABEL_COLOR,
+                font=Fonts.DIGITS_FONT_STYLE,
+                borderwidth=0,
+                command=lambda x=digit: self.add_to_expression(x))
+            button.grid(
+                row=grid_value[0],
+                column=grid_value[1],
+                sticky=tk.NSEW)
 
     def append_operator(self, operator):
         self.current_expression += operator
@@ -93,8 +127,14 @@ def append_operator(self, operator):
     def create_operator_buttons(self):
         i = 0
         for operator, symbol in self.operations.items():
-            button = tk.Button(self.buttons_frame, text=symbol, bg=OFF_WHITE, fg=LABEL_COLOR, font=DEFAULT_FONT_STYLE,
-                               borderwidth=0, command=lambda x=operator: self.append_operator(x))
+            button = tk.Button(
+                self.buttons_frame,
+                text=symbol,
+                bg=Colors.OFF_WHITE,
+                fg=Colors.LABEL_COLOR,
+                font=Fonts.DEFAULT_FONT_STYLE,
+                borderwidth=0,
+                command=lambda x=operator: self.append_operator(x))
             button.grid(row=i, column=4, sticky=tk.NSEW)
             i += 1
 
@@ -105,8 +145,14 @@ def clear(self):
         self.update_total_label()
 
     def create_clear_button(self):
-        button = tk.Button(self.buttons_frame, text="C", bg=OFF_WHITE, fg=LABEL_COLOR, font=DEFAULT_FONT_STYLE,
-                           borderwidth=0, command=self.clear)
+        button = tk.Button(
+            self.buttons_frame,
+            text="C",
+            bg=Colors.OFF_WHITE,
+            fg=Colors.LABEL_COLOR,
+            font=Fonts.DEFAULT_FONT_STYLE,
+            borderwidth=0,
+            command=self.clear)
         button.grid(row=0, column=1, sticky=tk.NSEW)
 
     def square(self):
@@ -114,8 +160,14 @@ def square(self):
         self.update_label()
 
     def create_square_button(self):
-        button = tk.Button(self.buttons_frame, text="x\u00b2", bg=OFF_WHITE, fg=LABEL_COLOR, font=DEFAULT_FONT_STYLE,
-                           borderwidth=0, command=self.square)
+        button = tk.Button(
+            self.buttons_frame,
+            text="x\u00b2",
+            bg=Colors.OFF_WHITE,
+            fg=Colors.LABEL_COLOR,
+            font=Fonts.DEFAULT_FONT_STYLE,
+            borderwidth=0,
+            command=self.square)
         button.grid(row=0, column=2, sticky=tk.NSEW)
 
     def sqrt(self):
@@ -123,8 +175,14 @@ def sqrt(self):
         self.update_label()
 
     def create_sqrt_button(self):
-        button = tk.Button(self.buttons_frame, text="\u221ax", bg=OFF_WHITE, fg=LABEL_COLOR, font=DEFAULT_FONT_STYLE,
-                           borderwidth=0, command=self.sqrt)
+        button = tk.Button(
+            self.buttons_frame,
+            text="\u221ax",
+            bg=Colors.OFF_WHITE,
+            fg=Colors.LABEL_COLOR,
+            font=Fonts.DEFAULT_FONT_STYLE,
+            borderwidth=0,
+            command=self.sqrt)
         button.grid(row=0, column=3, sticky=tk.NSEW)
 
     def evaluate(self):
@@ -140,8 +198,14 @@ def evaluate(self):
             self.update_label()
 
     def create_equals_button(self):
-        button = tk.Button(self.buttons_frame, text="=", bg=LIGHT_BLUE, fg=LABEL_COLOR, font=DEFAULT_FONT_STYLE,
-                           borderwidth=0, command=self.evaluate)
+        button = tk.Button(
+            self.buttons_frame,
+            text="=",
+            bg=Colors.LIGHT_BLUE,
+            fg=Colors.LABEL_COLOR,
+            font=Fonts.DEFAULT_FONT_STYLE,
+            borderwidth=0,
+            command=self.evaluate)
         button.grid(row=4, column=3, columnspan=2, sticky=tk.NSEW)
 
     def create_buttons_frame(self):