diff --git a/cosmic-theme/src/output/gtk4_output.rs b/cosmic-theme/src/output/gtk4_output.rs
index a5963ba8..1c027b8a 100644
--- a/cosmic-theme/src/output/gtk4_output.rs
+++ b/cosmic-theme/src/output/gtk4_output.rs
@@ -181,9 +181,9 @@ stack:backdrop > box > image,
 .toggle:backdrop > box > contents > image {{
 	filter: grayscale(1) brightness(1.7);
 }}
-window {
+window {{
 	border-radius: 6px;
-}
+}}
 "#};
 
         css.push_str(&component_gtk4_css("accent", accent));