remove opacity utlitilies from example CSS (#35877)

These are included in Bootstrap itself now

Co-authored-by: XhmikosR <xhmikosr@gmail.com>

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 72f7b8302269c9aeccf91750ab3450623568d299..2aaff18805d7c6dae20571d06164899224cf79f8 100644 (file)
--- 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;