diff --git a/lib/web/css/docs/source/_messages.less b/lib/web/css/docs/source/_messages.less
index 91b3f280880ca..7ae99b42781cc 100644
--- a/lib/web/css/docs/source/_messages.less
+++ b/lib/web/css/docs/source/_messages.less
@@ -156,7 +156,7 @@
 //    @message__<b>custom</b>-border-color: orange;
 //    @message__<b>custom</b>-icon: @icon-settings;
 //    @message__<b>custom</b>-icon-color: #000;
-//    @message__<b>custom</b>-icon-background: #green;
+//    @message__<b>custom</b>-icon-background: green;
 //    @message__<b>custom</b>-icon-top: 15px;
 //    @message__<b>custom</b>-icon-right: false;
 //    @message__<b>custom</b>-icon-bottom: false;
@@ -186,7 +186,7 @@
 
 @message-custom-icon: @icon-settings;
 @message-custom-icon__color-lateral: @color-black;
-@message-custom-icon__background: #green;
+@message-custom-icon__background: green;
 @message-custom-icon__top: 15px;
 @message-custom-icon__right: false;
 @message-custom-icon__bottom: false;