diff --git a/src/public/app/widgets/ribbon_widgets/classic_editor_toolbar.js b/src/public/app/widgets/ribbon_widgets/classic_editor_toolbar.js
index cd4dc2f39..384a8493d 100644
--- a/src/public/app/widgets/ribbon_widgets/classic_editor_toolbar.js
+++ b/src/public/app/widgets/ribbon_widgets/classic_editor_toolbar.js
@@ -7,13 +7,18 @@ const TPL = `\
 <style>
     .classic-toolbar-widget {
         --ck-color-toolbar-background: transparent;
-        --ck-color-button-default-background: transparent;
+        --ck-color-button-default-background: transparent;        
+        --ck-color-button-default-disabled-background: transparent;
         min-height: 39px;
     }
 
     .classic-toolbar-widget .ck.ck-toolbar {
         border: none;
     }
+
+    .classic-toolbar-widget .ck.ck-button.ck-disabled {
+        opacity: 0.3;
+    }
 </style>
 `;