[eluser]John_Betong[/eluser]
I think that the CSS file should be part of the application.
I have my CSS files in a ./css directory within the application folder.
Code:
<base href="<?= base_url() .APPPATH ?>" />
<link type="text/css" href="./css/ss_green.css" rel="stylesheet" />
This is ideal for copying/zipping the whole application directory and not having to scratch around for files outside of the application. It works for both localhost and online.