Firefox only. Works, see the pic. Google Gmail YouTube
This is a style to go with my http://freestyler.ws/style/79027/youtube-for-the-night-owls-2013-dark . If you have a style for Google installed, it might include the sign on page, too. This styles might conflict. If you'd like to use my style instead, you will have to find the code for this page in another style and comment it. I may be able to help - start a new discussion and give me a link to the style you're using, no rating is needed in this case.

I hide 'keep me signed' and 'need help?'. If you want it back, start a discussion and i'll tell what to do. Or simply uncomment the coordinating stuff in the top 2 blocks. If you need to go back to the first sign-in box, use browser back button.