theme not fitting to Iphone or android

I have just finished my new website http://theramblingroots.com however the resizing function is working fine apart from when you look at it from Iphone or anything small. The website is a fraction of the size of the screen and the rest is taken up with black. At first I thought it was just my background settings but I have no colours selected. I am at a loose end after trying to go through all my Index.php code to solve the problem but go no where. Please help!