font too small in input box and textarea

I'm running my website on the iphone and text entered in input boxes and textarea is very small vs the standard version on the iphone. How and where can I change these settings to increase font size? I use chronoform to create my forms and currently use Joomla 1.5

Thanks.

What is url of the page with form?

on my website www.pazou.ca the mobile version displays the member input box in very small font. when entering text in these input box, you can hardly see the text entered.

Thanks.