diff --git a/app/assets/stylesheets/comment-content.css b/app/assets/stylesheets/comment-content.css
index fd0af5808..c4ddba7db 100644
--- a/app/assets/stylesheets/comment-content.css
+++ b/app/assets/stylesheets/comment-content.css
@@ -43,7 +43,7 @@
     font-size: 0.85em;
   }
   
-  :where(pre) {
+  :is(pre) {
     overflow-x: auto;
     text-wrap: nowrap;
   }