tanzaku theme view in iphone

Hi,

I m using the tanzaku theme. I try to view the
http://www.tripleships.com in iphone, and it has bcome one column and it fit to the width in iphone nicely.

Someone taught me to add in
<meta name=”viewport” content=”width=350px” />
in the header.

answer from here:
http://wordpress.org/support/topic/397697?replies=8

but when i view mine in iphone, i realised my size is small and not fit to the iphone.
why is it?
i try to see if there is css styling, but i dun see in the original tanzaku theme.

any ideas?

my web url: http://nana4design.net

Thanks!