[Python] tkinter rounded button has white border

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)

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