Thread:Extension talk:InputBox/Text wiki markup/formatting/reply

Along those lines, anyone have any thoughts on how to add style settings to the submit button as well? Example, I would like to enlarge the text for the "Join" button on the top section of this page: Project:WikiProject Extensions/Participants

If it's not currently possible, perhaps adding a setting to the code? I took a quick look and seems pretty straight-forward (for the above as well). I'd be willing to help with that.