What is meant by @ in css?

Question

I`m trying to manipulate the css of the zimbra, I do not mean a thing, in some style files i found this:

body    {   @ChromeBg@  }

who can explain the usage of @, after and before ChromeBg?

Answer 1

This is specific to Zimbra, apparently. I hope this explains more:

http://wiki.zimbra.com/wiki/Creating_Themes_Long_Version#Editing_Theme_Substitution_Files