Mobile site display issue with side navigation

My site is http://www.sengkanggrp.com

Issue 1.
On the mobile site, it seems that the top portion of the main content is being blocked by the navigation bar.

Any way to fix this?

Issue 2.
At this page, http://www.sengkanggrp.com/rice/ I am trying to setup a Fullwidth Portfolio with selected categories oil and egg, however, when I type in oil, egg into the category slug, the whole portfolio widget does not appear on the site.

Thanks in advance!