diff --git a/styles/less/ui/countdown/countdown.less b/styles/less/ui/countdown/countdown.less
index 66a6c88a..16ad7c5e 100644
--- a/styles/less/ui/countdown/countdown.less
+++ b/styles/less/ui/countdown/countdown.less
@@ -36,7 +36,7 @@
         transition: opacity var(--ui-fade-duration);
     }
 
-    :not(.performance-low, .noblur) {
+    &:not(.performance-low, .noblur) {
         backdrop-filter: blur(5px);
     }