Reduce width registration form

I need to reduce width registration form. It's possibile decrease font or find any solution..?
Because form: Zone and sub-zone are too long.

can you please be more precise with this as i am not finding it.



***********Sure, you need to edit the CSS of HikaShop via the interface in the configuration under the tab display in the CSS area and change the code:
#address_country, #address_state{ width: 100px; } ************

i am using 1.6.0
joomla 2.5.7