Sorry for the delay. You can add something like the following to your template or to a
Joomla Login theme for SCLogin
file:
.sclogin-joomla-login input {
width: 50px !important;
}
That width will be used for the boxes. The default width, I believe is about 90px, so anything smaller should make it a little better on smart phones.
I hope that helps, but if not, just let us know.
Thanks,
Alex