How to execute tests with selenium webdriver while browser is minimized

import selenium
from selenium import webdriver
from selenium.webdriver.support.ui import Select
import os
import datetime
from tkinter import *
from tkinter import filedialog
from tkinter import messagebox as msgbox

# Using Chrome to access web
driver = webdriver.Chrome()


master = Tk()
master.resizable(0, 0) #0 means false
genType = StringVar(master)       
options = ["1-Day Admission Only", "Audio Only"]
genType.set(options[0])


def optionChanged(var):
    if var == "1-Day Admission Only":
        met()
    elif var == "Audio Only":
        met()

genTypeMenu = OptionMenu(master, genType, *options, command=optionChanged)
        
def start():
    opt = genType.get()
          
    if opt == "1-Day Admission Only":


        
def met_one_day_admission():
    for i in range(int(qty.s.get())): 
        #do somethig here
        
b = Button(master, text="Start", width=20, command=start, fg="red")    
qty = entry_with_label("Quantity :", "100")


genTypeMenu.pack()
b.pack()