site header menu position

I am having trouble getting the Header media right on www.pauldicksonbooks.co.uk. It displays fine on a laptop but in landscape orientation on my iPhone it takes off the top of the first row of books. Can anything be done about this please? I have already tried introducing more space around the books, but it is getting to the point of having too much grey around them to look good now. Also the "Welcome to Paul Dickson Books" is not central on the page. Thanks, Chris