How do I erase that edge on Canvas?

Question

I want to erase this edge that’s around Canvas, but I can’t find which attribute determines its existence.

Could someone help me?

The code:

class Tela():
    def __init__(self, resolucao:str):
        self.inst = Tk()
        self.inst['bg'] = 'black' 
        self.inst['relief'] = 'flat'
        
        resolucao = resolucao.split('x')
        print(resolucao)

        self.canvas = Canvas(self.inst, background='black', bd=0
        , width=int(resolucao[0]), height=int(resolucao[1])-100)
        
        self.canvas.pack()
        self.inst.mainloop()

Tela('640x480')