Zoomed out on mobile

Hello everyone,

I’ve installed wordpress 3.5 on my website, I deleted all the pages.
I created ONLY one page named Test, a blank page with only one word: “test”. I activated the Twenty Twelve theme and:

When I try to view my website from Opera Mini 7.1 my site is zoomed out , the text appears very tiny and I need to zoom in order to make the content fit my screen. I am able to move left and right (where is no content, the content is on the middle and I have blank spaces on the left and right when I zoom in :(( )

On the other hand, when I access https://twentytwelvedemo.wordpress.com/ on the same browser (Opera mini) everything looks the way it should, the content is zoomed in. All the content is wraped 100% of my screen width and I can’t move left or right only up and down (and that’s exactly what I want on my website)