Thanks.
I pretty much came to the same conclusion earlier today.
Then I realised it's also possible to customize the Offline Joomla Login Module, using:
- font icons
- buttons
After all it's what Joomla developpers did on the admin back-end.
But, as you said, this latter alternative may recquire Jquery and other stuffs to work.
Still having a go at it..
Ultimately, your way will probably be easier to implement and more safe.
Case solved.
Regards