Anspress is wrapped on mobile site view

Anspress on mobile site displays all contents wrapped. How should I modify the .css so that all the contents have the same aspect ratio as it is viewed on desktop?
For example, if you see a photo on Facebook and if you resize your browser, the photo doesn’t go out of the browser’s boundary, i.e., you don’t need scrollbars to view the photo, instead the photo is resized and made to fit inside the browser with the same aspect ratio.
Below is the picture of how Anspress looks on mobile devices :

Here is the search widget out of the boundary :

This is how stackoverflow looks, I want to make Anspress look like this, please help me how to :