maybe you need to set your window-size dimension. just like:
options = webdriver.ChromeOptions()
options.add_argument('--headless')
options.add_argument('--disable-gpu')
options.add_argument('--window-size=1920x1080');
browser = webdriver.Chrome(options=options,executable_path = './chromedriver')
if also not working, try increase window-size dimension.