how get no border effect in tkinter ttk?
What you want can be achieved by setting the button relief to flat or borderwidth to 0 using a ttk style. However, some ttk themes don't take into account these style settings, and one of them is the default theme in Windows. Setting the theme to 'clam' or 'alt' should solve your problem.
import tkinter as tkfrom tkinter import ttkroot = tk.Tk()b1 = tk.Button(root, text='tk.Button', borderwidth=0)b1.pack()s = ttk.Style(root)s.theme_use('clam')s.configure('flat.TButton', borderwidth=0)# s.configure('flat.TButton', relief='flat') gives the same resultb2 = ttk.Button(root, style='flat.TButton', text='ttk.Button')b2.pack()root.mainloop()