from tkinter import *
import random
root = Tk()
root.geometry("400x400")
root.resizable(0, 0)
root.config(bg="#103030")
root.title("Rifar ")

def Rifar():
    numero = random.randint(1,99)
    texto_sub1.config(text=numero)
def limpar():
    texto_sub1.config(text="")


texto_sub1 = Label(text="",
                   font=("Arial", "190", "bold"), bg="#103030", fg="#49e3e3")
texto_sub1.place(relx=0.15, rely=0.05)

but1 = Button(text="Calcular", bd=2, bg='#107db2', fg='white',
              font=('verdana', 12, 'bold'), command=Rifar)
but1.place(relx=0.1, rely=0.8, relwidth=0.25, relheight=0.1)

but_limpar = Button(text="Limpar", bd=2, bg='#107db2', fg='white',
                    font=('verdana', 12, 'bold'), command=limpar)
but_limpar.place(relx=0.4, rely=0.8, relwidth=0.25, relheight=0.1)

but_sair = Button(text="Sair", bd=2, bg='#107db2', fg='white',
                  font=('verdana', 12, 'bold'), command=root.destroy)
but_sair.place(relx=0.7, rely=0.8, relwidth=0.25, relheight=0.1)

root.mainloop()