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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def find_elements_by_css_selector(self, css_selector):
 """ Finds elements by css selector. :Args: - css_selector - CSS selector string, ex: 'a.nav#home' :Returns: - list of WebElement - a list with elements if any was found. An empty list if not :Usage: :: elements = driver.find_elements_by_css_selector('.foo') """

        return self.find_elements(by=By.CSS_SELECTOR, value=css_selector)