Responsive website on iPhone - unwanted white space on rotate from landscape to portrait

Question

I am creating a responsive website, and have just noticed a strange behaviour in my content pages when viewed on the iPhone. It scales correctly when loaded in portrait mode

Answer 1

I tried all what has been suggested here, nothing works. Then I've relized that it connect with scale of page. So then I added to header.php in my main theme's folder and it 's fixed problem.