diff --git a/assets/css/_page/_single.scss b/assets/css/_page/_single.scss
index 0890f341..6e6aab9d 100644
--- a/assets/css/_page/_single.scss
+++ b/assets/css/_page/_single.scss
@@ -399,7 +399,7 @@
       @include link(false, true);
     }
 
-    sup[id^='fnref:']:has(.footnote-ref) {
+    sup[id^='fnref']:has(.footnote-ref) {
       padding: 2px 4px;
       background-color: rgba(238, 238, 238, 0.7);
       color: #555555;