change background colour cs cart professional 3 latest version

Can any one please help? I am trying to change the background colour of the latest version of cs cart professional that I have just bought. I have looked at the forum and tried everything. I went through the help desk and they sent me this email back



[size=1]In order to change it, please try doing the following.


  1. Create the following path: skins/food/customer/addons/my_changes and a file with the styles.css name and the following content in it:[/size]

    body {



    background-color: green;



    }







    [size=1]2. Save the file.
  2. Create the hooks/index path in the skins/food/customer/addons/my_changes/hooks/index directory and the styles.post.tpl file with the following content in it:[/size]



[size=1]4. Save the file.

After that please clear the cache:

[url="http://kb.cs-cart.com/changes-not-displayed"]http://kb.cs-cart.com/changes-not-displayed[/url][/size]

I have done this and nothing will work. I have gone into the syle css file and changed the colour code but the change in the code will not save why would that be?

I am new to this and any help would be greatly appreciated thanks