Sorry for the delay. It sounds like there's a template CSS conflict with that button. To fix, you can simply add the following to your template's CSS to ensure the proper background color is set on hover:
.sclogin button.btn:hover {
background: black;
}Obviously, you can change that color to anything.
In the next release of the SCLogin module, there will be a broken out stylesheet that will be easier to add a style like that. Unfortunately, for now, our CSS is one large file that's not terribly easy to edit.
I hope that helps, but if you need anything else, just let me know.
Thanks,
Alex
Problem with the button color divided
