tkinter rounded button has white border

Question

I managed to find in someone who made a class for rounded buttons in tkinter that works great. However the issue I have is there is always a white border. I've tried reading through all of the code and changing all of the colour values but to no avail.

Here is an excerpt of the code working, I've tried to format it as nicely as I could:

from tkinter import Tk, Canvas


class RoundedButton(Canvas):
    def __init__(self, master=None, text: str = "", radius=25, btnforeground="#007CEE", btnbackground="#ffffff",
                 clicked=None, font=("Righteous", 25), *args, **kwargs):
        super(RoundedButton, self).__init__(master, *args, **kwargs)
        self.config(bg=self.master["bg"])
        self.btnbackground = btnbackground
        self.btnforeground = btnforeground
        self.clicked = clicked

        self.radius = radius

        self.rect = self.round_rectangle(0, 0, 0, 0, tags="button", radius=radius, fill=btnbackground)
        self.text = self.create_text(0, 0, text=text, tags="button", fill=btnforeground, font=font,
                                     justify="center")

        self.tag_bind("button", "<ButtonPress>", self.border)
        self.tag_bind("button", "<ButtonRelease>", self.border)
        self.bind("<Configure>", self.resize)

        text_rect = self.bbox(self.text)
        if int(self["width"]) < text_rect[2] - text_rect[0]:
            self["width"] = (text_rect[2] - text_rect[0]) + 10

        if int(self["height"]) < text_rect[3] - text_rect[1]:
            self["height"] = (text_rect[3] - text_rect[1]) + 10

    def round_rectangle(self, x1, y1, x2, y2, radius=25, update=False,
                        **kwargs):  # if update is False a new rounded rectangle's id will be returned else updates existing rounded rect.
        # source: https://stackoverflow.com/a/44100075/15993687
        points = [x1 + radius, y1,
                  x1 + radius, y1,
                  x2 - radius, y1,
                  x2 - radius, y1,
                  x2, y1,
                  x2, y1 + radius,
                  x2, y1 + radius,
                  x2, y2 - radius,
                  x2, y2 - radius,
                  x2, y2,
                  x2 - radius, y2,
                  x2 - radius, y2,
                  x1 + radius, y2,
                  x1 + radius, y2,
                  x1, y2,
                  x1, y2 - radius,
                  x1, y2 - radius,
                  x1, y1 + radius,
                  x1, y1 + radius,
                  x1, y1]

        if not update:
            return self.create_polygon(points, **kwargs, smooth=True)

        else:
            self.coords(self.rect, points)

    def resize(self, event):
        text_bbox = self.bbox(self.text)

        if self.radius > event.width or self.radius > event.height:
            radius = min((event.width, event.height))

        else:
            radius = self.radius

        width, height = event.width, event.height

        if event.width < text_bbox[2] - text_bbox[0]:
            width = text_bbox[2] - text_bbox[0] + 30

        if event.height < text_bbox[3] - text_bbox[1]:
            height = text_bbox[3] - text_bbox[1] + 30

        self.round_rectangle(5, 5, width - 5, height - 5, radius, update=True)

        bbox = self.bbox(self.rect)

        x = ((bbox[2] - bbox[0]) / 2) - ((text_bbox[2] - text_bbox[0]) / 2)
        y = ((bbox[3] - bbox[1]) / 2) - ((text_bbox[3] - text_bbox[1]) / 2)

        self.moveto(self.text, x, y)

    def border(self, event):
        if event.type == "4":
            self.itemconfig(self.rect, fill="#DE8500")
            self.itemconfig(self.text, fill='#ffffff')
            if self.clicked is not None:
                self.clicked()

        else:
            self.itemconfig(self.rect, fill=self.btnbackground)
            self.itemconfig(self.text, fill=self.btnforeground)


window = Tk()
window.geometry("1440x872")
window.configure(bg="#007CEE")

download_button_1 = RoundedButton(
    text="Download",
    font=("Righteous", 30),
    borderwidth=0)
download_button_1.place(
    x=409,
    y=383,
    width=621.0,
    height=105.0
)

window.mainloop()

EDIT: Furas' answer works perfect, for anyone interested in using this rounded button class I would reccommend changing the splinesteps to a higher value at self.create_polygon to help with smoothing

return self.create_polygon(points, **kwargs, smooth=True, splinesteps=10000)

Answer 1

On Linux works for me

highlightthickness=0

or set color of background

highlightbackground="#007CEE"

eventually

borderwidth=-1

---

Doc for Canvas (page effbot.org on archive.org) shows all config options.

---

Before:

After:

Answer 2

2023.01.28: Using: Pop!_OS 22.04 LTS //Python 3.10.6// Tcl/Tk V.8.6

"borderwidth=-1" did not seem to work, but "highlightthickness=0" appeared to do exactly what I expected. Resulting button with rounded corners

And I used an exact copy of the code posted in the original question (by: Cai Allin,Mar 10, 2022 at 21:21) My only changes were in the block for the "Rounded button". First I tested to change the "borderwidth"

download_button_1 = RoundedButton(
    text="Download",
    font=("Righteous", 30),
    borderwidth=-1,
    )    

But this did not result in any visible change.

I then tested to just below the "borderwidth" add:

highlightthickness=0

And this change succeeded in removing the "white border", and it worked regardless whether the settings for the "borderwidth" was "-1" or "0"