You need to find the .dtl file from the Standard theme that includes the CSS files and copy them to your theme directory, if you haven't already.
 
If they are already there, you should search and replace 'Standard' with 'GOPS' in those files.
 
In my case, I have copied header.dtl and changed this line:
 
  <link href="$Config{"Frontend::CSSPath"}YOURTHEMENAME/agent.css" rel="stylesheet" type="text/css"/>
Regards,
 
/Martin.

>>> Justin Noel <otrs@jandgnoel.com> 10. februar 2010 09:05 >>>
I'm using OTRS 2.4.6.

I have a theme called GOPS. I have it entered in the database properly. The structure is built properly as follows :

/opt/otrs/Kernel/Output/HTML/GOPS
/opt/otrs/var/httpd/htdocs/css/GOPS

The HTML theme works just fine. Any changes to .dtl files I make in the GOPS directory are reflected in the output.

Unfortunately, the css changes will not take effect. When troubleshooting, I see the HTML header is calling the css file at /otrs-web/css/Standard/agent.css instead of /otrs-web/css/GOPS/agent.css

How in the world do I get OTRS to use the GOPS css file? The permissions, owner, and group are all set properly (even a little non-restrictive):

drwxrwxr-x 6 otrs daemon 4096 Feb 10 02:51 .
drwxrwxr-x 6 otrs daemon 4096 Jan 13 11:19 ..
drwxrwxr-x 2 otrs daemon 4096 Feb 10 02:51 GOPS
drwxrwxr-x 2 otrs daemon 4096 Jan 12 14:58 Lite
drwxrwxr-x 3 otrs daemon 4096 Jan 12 14:58 overcast
drwxrwxr-x 2 otrs daemon 4096 Jan 12 14:58 Standard

[root@myserver.com GOPS]# ls -la
total 28
drwxrwxr-x 2 otrs daemon 4096 Feb 10 02:51 .
drwxrwxr-x 6 otrs daemon 4096 Feb 10 02:51 ..
-rw-rw-rw- 1 otrs daemon 8996 Feb 10 02:52 agent.css
-rw-rw-rw- 1 otrs daemon 6039 Feb 10 02:51 customer.css