I have followed the instructions for changing the css using hooks in 2.2.1 (link below), but my changes are not taking effect. Does this method still work with the latest version of CS-Cart? And yes, I have the my changes addon installed and available. It's working for everything but css. Also, I'm using the austere skin.
Post what you have in your skins/…/customer/addons/my_changes/hooks/index/styles.post.php file and maybe we can help you.
Do you see reference to the 'link' for your local css when you do a 'view page source'?
[quote name=‘tbirnseth’ timestamp=‘1310160556’ post=‘116646’]
Post what you have in your skins/…/customer/addons/my_changes/hooks/index/styles.post.php file and maybe we can help you.
Do you see reference to the ‘link’ for your local css when you do a ‘view page source’?
[/quote]
Actually, I had the styles.css one directory level too deep. My bad! 
Oops, I hate it when that happens! 
Strongly suggest you use a different filename since debuggers like firebug will only show the filename and not the path to it. Us something like local_style.css or my_styles.css or something unique.