diff --git a/docs/en/docs/css/custom.css b/docs/en/docs/css/custom.css
index 87111ff64e..7c50dbd9be 100644
--- a/docs/en/docs/css/custom.css
+++ b/docs/en/docs/css/custom.css
@@ -203,3 +203,8 @@ Inspired by Termynal's CSS tricks with modifications
   -webkit-box-shadow: 25px 0 0 #f4c025, 50px 0 0 #3ec930;
           box-shadow: 25px 0 0 #f4c025, 50px 0 0 #3ec930;
 }
+
+.md-typeset dfn {
+  border-bottom: .05rem dotted var(--md-default-fg-color--light);
+  cursor: help;
+}