diff --git a/cosmic-theme/src/output/gtk4_output.rs b/cosmic-theme/src/output/gtk4_output.rs
index d3416090..14f40efc 100644
--- a/cosmic-theme/src/output/gtk4_output.rs
+++ b/cosmic-theme/src/output/gtk4_output.rs
@@ -146,10 +146,10 @@ impl Theme {
 	background: {window_control_hover_bg};
 }}
 .image-button > image,
-.image-button > box {
+.image-button > box {{
 	transition: 0;
 	color: @accent_bg_color;
-}
+}}
 "#};
 
         css.push_str(&component_gtk4_css("accent", accent));