Tkinter solid border button
I also tried changing the black border but it doesn't change though it works if I change from Label to Frame so you can put your label inside the frame and change the highlightbackground, highlightcolor, borderwith of the frame.
Here's what I did
for x in range(3): for y in range(3): con_frame = tk.Frame(top_frame,bg="#41B77F", highlightbackground="grey", highlightcolor="grey", relief="solid", highlightthickness=3) lbl = tk.Label(con_frame, text="", height=2, width=5, bg="#41B77F", font="Helvetica 45 bold", bd=0, highlightthickness=0) lbl.grid(sticky='nsew') lbl.bind("<Button-1>", lambda e, xy=[x, y]: get_cordinate(xy)) con_frame.grid(row=x, column=y, padx=2, pady=2) dict_labels = {"xy": [x, y], "symbol": "", "label": lbl, "ticked": False} list_labels.append(dict_labels)