Changing the font size of the values in the selection section in the combobox in tkinter

When I make a combobox in tkinter and click the arrow to select a value then the font size of the values is very less. When I change the font size then the font size of text in the entry box becomes bigger but the font size of the values in the selection section stays the same. How can I change the size of the values in the selection section?

from tkinter import *
from tkinter import ttk

WIDTH, HEIGHT = 1000, 300

root = Tk()

root.geometry(f"{WIDTH}x{HEIGHT}")

def createDropBox(master, dropBoxData, fg, bg, fontSize):
    ttk.Style().configure("style1.TCombobox", foreground = fg, background = bg)
    dropBox = ttk.Combobox(master, values = dropBoxData, style = "style1.TCombobox", font = ("", fontSize), width = 60)
    return dropBox

values = ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
dropBox = createDropBox(root, values, "blue", "white", 20)
dropBox.place(x = 20, y = 20)

root.mainloop()

Answer

You can add a tkinter option to increase the font for list boxes within combo boxes. Add this to your code right before root.mainloop():

from tkinter.font import Font
font = Font(family = "Helvetica", size = 20)
root.option_add("*TCombobox*Listbox*Font", font)