PySimpleGUI/Demo_Borderless_Window.py

import PySimpleGUI as sg

"""
Turn off padding in order to get a really tight looking layout.
"""

sg.ChangeLookAndFeel('Dark')
sg.SetOptions(element_padding=(0, 0))
layout = [[sg.T('User:', pad=((3, 0), 0)), sg.OptionMenu(values=('User 1', 'User 2'), size=(20, 1)),
           sg.T('0', size=(8, 1))],
          [sg.T('Customer:', pad=((3, 0), 0)), sg.OptionMenu(values=('Customer 1', 'Customer 2'), size=(20, 1)),
           sg.T('1', size=(8, 1))],
          [sg.T('Notes:', pad=((3, 0), 0)), sg.In(size=(44, 1), background_color='white', text_color='black')],
          [sg.ReadFormButton('Start', button_color=('white', 'black')),
           sg.ReadFormButton('Stop', button_color=('gray50', 'black')),
           sg.ReadFormButton('Reset', button_color=('white', '#9B0023')),
           sg.ReadFormButton('Submit', button_color=('gray60', 'springgreen4')),
           sg.SimpleButton('Exit', button_color=('white', '#00406B'))]]

form = sg.FlexForm("Time Tracker", default_element_size=(12, 1), text_justification='r', auto_size_text=False,
                   auto_size_buttons=False, no_titlebar=True,
                   default_button_element_size=(12, 1))

form.Layout(layout)

while True:
    button, values = form.Read()
    if button is None or button == 'Exit':
        break