I'm trying to create a bot to access instagram, but I don't understand why it's giving an error, here's the code:

```
from time import sleep
from selenium import webdriver

browser = webdriver.Firefox()
browser.implicitly_wait(5)

browser.get('https://www.instagram.com/')

login_link = browser.find_element_by_xpath("//a[text()='Log in']")
login_link.click()

sleep(2)

username_input = browser.find_element_by_css_selector("input[name='username']")
password_input = browser.find_element_by_css_selector("input[name='password']")

username_input.send_keys("username")
password_input.send_keys("12345678")

login_button = browser.find_element_by_xpath("//button[@type='submit']")
login_button.click()

sleep(5)

browser.close()  

```

and the error on cmd is this: 

```
Traceback (most recent call last):
  File "C:\Users\*******\Desktop\bot instagram da net.py", line 9, in <module>
    login_link = browser.find_element_by_xpath("//a[text()='Log in']")
  File "C:\Users\*******\AppData\Local\Programs\Python\Python38-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 394, in find_element_by_xpath
    return self.find_element(by=By.XPATH, value=xpath)
  File "C:\Users\*******\AppData\Local\Programs\Python\Python38-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 976, in find_element
    return self.execute(Command.FIND_ELEMENT, {
  File "C:\Users\*******\AppData\Local\Programs\Python\Python38-32\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "C:\Users\*******\AppData\Local\Programs\Python\Python38-32\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: //a[text()='Log in']

```

I TRIED PUT A SLEEP AFTER BROWSER.GET, BUT HAD THE SAME ERROR