X-Cart forums - Styling the Checkout buttons

I want to style the add to cart and the rest of the checkout buttons, so I can make them bigger and bolder to improve usability. I have successfuly modified all of them, except the last one "SUBMIT ORDER." Where is it?

I tougth it was in checkout.tpl, so I replaced:

Code:

{include file="buttons/button.tpl" button_title=$lng.lbl_submit_order style="button" href=$button_href}

with this:

Code:

{include file="buttons/submit-order-button.tpl" button_title=$lng.lbl_submit_order style="submitbutton" href=$button_href}

Then I created a file named submit-order-button.tpl and added a style named submitbutton but it doesnt change!

Can anyone be so kind to give me a hint?