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.

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; }

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

I wanted to say ADD not CHANGE. So it's normal that you don't find it.