diff --git a/css/style.css b/css/style.css
index 584bade..f0e9a67 100644
--- a/css/style.css
+++ b/css/style.css
@@ -361,7 +361,7 @@ table caption::before {
 /* footnotes */
 
 a.footnote-ref sup::before {
-  content: "^[";
+  content: "\2060[";
 }
 
 a.footnote-ref sup::after {