How to make calculator with CustomTkinter

from tkinter import * from tkinter import messagebox import customtkinter def add(): a = float(ent1.get()) b = float(ent2.get()) c = a + b result.configure(text=str(c)) def subtract(): a = float(ent1.get()) b = float(ent2.get()) c = a - b result.configure(text=str(c)) def multipy(): a = float(ent1.get()) b = float(ent2.get()) c = a * b result.configure(text=str(c)) def divide(): a = float(ent1.get()) b = float(ent2.get()) c = a / b result.configure(text=str(c)) customtkinter.set_appearance_mode("dark") window=customtkinter.CTk() window.geometry("550x500") window.title("Calculator") window.resizable(False,False) f1=customtkinter.CTkFrame(window,bg="#f1faee") f1.pack(expand=True,fill=BOTH) la1=customtkinter.CTkLabel(f1,bg="#f1faee",text_color="white",text="First Number:",text_font=("",25)) la1.place(x=20,y=20) la2=customtkinter.CTkLabel(f1,bg="#f1faee",text_color="white",text="Second Number:",text_font=("",25)) la2.place(x=20,y=98) ent1=customtkinter.CTkEntry(f1,bg="#f1faee",text_color="silver",placeholder_text="Enter a number",width=220) ent1.place(x=300,y=26) ent2=customtkinter.CTkEntry(f1,bg="#f1faee",text_color="silver",placeholder_text="Enter a number",width=220,text_font=("",12)) ent2.place(x=300,y=110) btn1=customtkinter.CTkButton(f1,bg="#f1faee",text_color="white",text="Add",text_font=("",27),command=add,corner_radius=4,fg_color="#2a9d8f") btn1.place(x=340,y=220) btn2=customtkinter.CTkButton(f1,bg="#f1faee",text_color="white",text="Subtract",text_font=("",27),command=subtract,corner_radius=4,fg_color="#2a9d8f") btn2.place(x=340,y=320) btn3=customtkinter.CTkButton(f1,bg="#f1faee",text_color="white",text="Multipy",text_font=("",27),command=multipy,corner_radius=4,fg_color="#2a9d8f") btn3.place(x=70,y=220) btn4=customtkinter.CTkButton(f1,bg="#f1faee",text_color="white",text="Divide",text_font=("",27),command=divide,corner_radius=4,fg_color="#2a9d8f") btn4.place(x=70,y=320) Result=customtkinter.CTkLabel(f1,bg="#f1faee",text_color="orange",text="Result:",text_font=("",29)) Result.place(x=100,y=400) result=customtkinter.CTkLabel(f1,bg="#f1faee",text_color="orange",text="",text_font=("",29)) result.place(x=300,y=400) window.mainloop()