Hi Floskin
Your only real option would be to move your top menu to the left slightly. To do so you can add the following to the Custom CSS field of your templates parameters...
#hornav {margin-right: 80px;}
It is worth stating that not every visitor to your site will share the same screen size as you. This will explain why we were unable to see your issue as we use a bigger screen size. A 1280px wide screen as you are using accounts for only 8% of the current market share (
http://www.w3schools.com/browsers/browsers_display.asp).
Ciarán