Alter search button (css) width

[mi16chap]

Afternoon all

http://test.italianhampers.co.uk

I have altered the search toolbar in my site header to use the label "Go!" instead of the word "Search", however, the button is still the same width as previously set.

I set up a style in my stylesheet_css_buttons.css file as per

.button_search{width:33px;}

But if you look at my site, you can see this is being overridden by something else making it 80px (see attached screenshot with chrome "inspect element" enabled)



Can anyone tell me how to avoid this CSS conflict and make the button 33px?