Minimatica: problems with navigation bar on the header

I’ìm using the theme Minimatica. I followed the instructions in recent topics how to move the navigation bar from the bottom to the top, but I have a problem. The navigation bar is on the top ma the “black stripe”, that contains the title of the page or the post, overlaps with the navigation bar. How can I do to solve this problem? Please view: http://www.donindovinati.it/
Thanks!