Styling Log In Button

Hi all,
I’m using White Label CMS to do some styling on my login page, mostly working fine, but I am getting some issues where the styling on the Log In button is not working as I’d expect, there are some blue borders around the button and the text on it, but that isn’t showing in the css itself. I was under the impression that the css you wrote in WLC would overrule the original WP styling?

Problem shown in image:

and CSS can be downloaded here:

http://ntprintmedia.com/whitelabelcss/

Thanks for any help!