menu bar

my dev. site http://revitviet.vn

Pls show me how to change the height of menu bar to fix with the menu. Thank you.

I did it in Firebug

Before : http://dl.dropbox.com/u/15038223/10-18-2011%2011-09-33%20AM.png
After: http://dl.dropbox.com/u/15038223/10-18-2011%2011-10-47%20AM.png

But i dont know where can i change the code. Pls help me. thank you