def is_css_in_page?(css, flag=true)
      if flag
        assert page.has_css?("#{css}"), "Error: #{css} not found on page !"
      else
        assert !page.has_css?("#{css}"), "Error: #{css} found on page !"
      end
    end
def is_css_in_page?(css, flag=true)
      if flag
        assert page.has_css?("#{css}"), "Error: #{css} not found on page !"
      else
        assert !page.has_css?("#{css}"), "Error: #{css} found on page !"
      end
    end
Check that a css element is on the page, set flag to check that it isn't