Sorry for the delayed response to this. The 'forgot' buttons are actually in the /modules/mod_sclogin/helper.php file. Look for the getForgotUser and getForgotPassword functions around 329 and 345. Hopefully you can alter the code in there as you need. That code should probably be integrated into the template file itself for easier modification.
For the border/spacing, you should be able to use the following styles:
.sclogin {
padding: 35px;
margin: 35px;
border: solid 10px;
}
I think you honestly probably want no change to the margin and want about 60px of padding, but you can play how you want with that.
I hope that helps, but if not, let me know.
Thanks,
Alex