Fixed width & nextgen gallery on iPad

i have a problem using a fixed width together with the iPad browser.
the page alingns to the right side when using a fixed width of 1000px:
https://www.militaryscalemodelling.com
i used this code in my child theme:

#page {
margin: auto;
width: 1000px;
}

in any pc browser it centers the page nicely, but on the iPad it aligns the page to the right.
one more thing, when i use fixed width. my fancybox doesnt fill the full screen (does on pc) (i use fancybox and NGG)
if you need more info, please let me know.

thank you!