diff --git a/assets/css/app.css b/assets/css/app.css
index a91ed90..a49f1e4 100644
--- a/assets/css/app.css
+++ b/assets/css/app.css
@@ -174,4 +174,8 @@
   .hljs {
     background: transparent !important;
   }
+
+  a.invalid {
+    @apply line-through;
+  }
 }
\ No newline at end of file