diff --git a/styles/chaster/catppuccin.user.css b/styles/chaster/catppuccin.user.css
index 3bc8eed..ae9aeb5 100644
--- a/styles/chaster/catppuccin.user.css
+++ b/styles/chaster/catppuccin.user.css
@@ -18,7 +18,7 @@
 
 /* Apply Theme To Site
  * For help with URL rules, please see https://github.com/openstyles/stylus/wiki/Writing-styles#valid--moz-document-rules */
-@-moz-document regexp('https?://chaster.app(/.*)?') {
+@-moz-document regexp('https?://(?:sso\.)?chaster\.app(?:/.*)?') {
 
   /*  Palette Lookup Table
    *  Defining the Colors per Flavor called via: