Enhancement request number 377672, 382826 and 397619 has been implement in CAM version 8.1 and up.
To change the CSS for a single authenticator:
2 Select Enable advanced customization mode and click Save.
3 Click Authenticators and then click Edit on the authenticator that will use the alternative CSS.
5 Click Download Current Customization CSS to download the current theme.css file.
8. Upload the modified stylesheet to the Customize Appearance page in the Admin Settings