Small problem with a drop-down menu

Hi. The address is this: http://5com.ro/
Once you get into the longer subcategories that open to the right, the background isn't wide enough. I've been trying for 3 hours to fix it and i can't stand it anymore. Maybe some of you with more experience can spot the fix.

 

Hi Abh,
Try adding this to your wiznav.css :

#nav li:hover ul.sub li li a:hover 
{background:#3a93d2; color:#fff; width:100%}

Code (markup):

 

Yup, that works perfectly, thank you very much.