I am trying to set image as background. But I am facing problem like I can't put Label on that gui of tkinter

Here is my code:-

```
from tkinter import *

root=Tk()
root.title("SOHAM MAIL SENDER")
root.iconbitmap("F:\\PYTHON PROJECTS\\GMAIL\\img\\Mcdo-Design-Letter-Letter- 
GMail-pen.ico")

root.geometry("900x680")
file = PhotoImage(file = "F:\\PYTHON PROJECTS\\GMAIL\img\\gradient_2.png")
img = Label(root, image=file)
img.place(x=0, y=0, relwidth=1, relheight=1)
img.pack()
def time():
    string = strftime('%I:%M:%S %p')
    label.config(text=string)
    label.after(1000, time)
# time
label = Label(root, font=("ds-digital",35),  background= "#B7C3F9", 
foreground= "white")
time()
label.pack(side=TOP, pady=40)

root.mainloop()

```