Rodster,
Glad you like the intent.. though, yeah, it looks pretty terrible on your site
The problem for you is that there's a conflict between your template and our styles. Here's some quick fixes that will prevent your styles from overriding ours. If you implement these, you'll be 99% of the way there, and we can help with any other tweaks.
1) Edit the /modules/mod_sclogin/tmpl/joomlaLogin_horizontal.php file
2) Search for id="form-login-username" and replace with id="form-login-username123"
3) Search for id="form-login-password" and replace with id="form-login-password123"
4) Disable the System - Remember Me plugin (for now).
#2 & #3 are simply changing the ID name so your template can't find that code. #4 removes the checkbox. If you want it, we can help you get it back, but lets get things looking better first.
Let me know when those are done and if it's a good improvement or not and we'll go from there.
Thanks,
Alex