I'm trying to change the font size of my buttons in Tkinter so it's not so small. Does anyone have any idea on what I can do that might have the result that I'm looking for? Why is there so much text required for me to ask a question when I can ask it plainly and simply with less text?! 

```
from Tkinter import *
from tkFont import *

class App:
    def __init__(self):
        guiWindow = Tkinter.Tk()
        guiWindow.wm_title("FooBar")

        # Creates a custom font
        customFont = Font(size=18)

        # code to add widgets will go here
        buttonFrame = Frame()

        # colors the "ChangeLicense" button
        color = '#005DA6'

        # tells licenseChange what to do
        def openLicenseChange():
            print('Change License')

    #button properties
        licenseChange = Button(guiWindow,
                               command=openLicenseChange,
                               bd=20, bg=color, font=customFont,
                               text="Change License")

        buttonFrame.pack(side="top", fill="x")

        guiWindow.mainloop()
app=App()

```