diff --git a/site/content/docs/5.1/examples/list-groups/list-groups.css b/site/content/docs/5.1/examples/list-groups/list-groups.css
index 72f7b83022..2aaff18805 100644
--- a/site/content/docs/5.1/examples/list-groups/list-groups.css
+++ b/site/content/docs/5.1/examples/list-groups/list-groups.css
@@ -1,6 +1,3 @@
-.opacity-50 { opacity: .5; }
-.opacity-75 { opacity: .75; }
-
 .list-group {
   width: auto;
   max-width: 460px;