Changing Login Page Style

[turkey3]

Where is the CSS file and HTML file to change the login page? I want to change the background to grey to match my site and add a header at the top.

I'm on Ubuntu 14.

[inerd]

Vesta Web Directory: (You can find the webfront data here)

/usr/local/vesta/web/

then locate

CSS: /css/main.css
HTML: /templates/login.html