Where is the "wide" CSS class defined in Magento CE?

Question

The "wide" css class belongs to "li" elements in the address fields (checkout page, registration form).

I haven't found the "wide" class and its properties inside any of the css files. Where can I find it?

Answer 1

default/blank theme:

skin/frontend/default/blank/css/styles.css start at line 181

default/default theme:

skin/frontend/default/default/css/styles.css start at line 184

default/modern theme:

skin/frontend/default/modern/css/styles.css start at line 185

...