How do I resolve "NameError: name 'url' is not defined"?

NameError Traceback (most recent call last)                 
<ipython-input-20-ed48c50edfbb>in<module>                 
---->1html=get_page_from_amazon(url)                    
                    
NameError: name 'url' is not defined

 from selenium import webdriver
from selenium.webdriver.chrome.options import Options

def get_page_from_amazon(url):
     
    text=""
    # Launch Browser in Headless Mode
    options=Options()
    options.add_argument('--headless')
     
    # Launch Browser
    driver=webdriver.Chrome("chromedriver.exe", options=options)
    driver.get(url)
    driver.implicitly_wait(10)# Wait until 10 seconds if not found
     
    text=driver.page_source
         
    # US>Browser down
    driver.quit()
     
    return text

html=get_page_from_amazon(url)
soup = BeautifulSoup(html, 'lxml')

html=get_page_from_amazon(url)