# How to add a border color to a button in Tkinter in Python import tkinter as tk  root = tk.Tk()root.geometry('250x150')root.title("Button Border")  # Labell = tk.Label(root, text = "Enter your Roll No. :",             font = (("Times New Roman"), 15))l.pack()  # Entry Widgettk.Entry(root).pack()  # for space between widgetstk.Label(root, text=" ").pack()  # Frame for button border with black border colorbutton_border = tk.Frame(root, highlightbackground = "black",                          highlightthickness = 2, bd=0)bttn = tk.Button(button_border, text = 'Submit', fg = 'black',                 bg = 'yellow',font = (("Times New Roman"),15))bttn.pack()button_border.pack()  root.mainloop()