diff --git a/app/assets/javascripts/app/views/layout_ref/buttons.jst.eco b/app/assets/javascripts/app/views/layout_ref/buttons.jst.eco
index d4a31f52f..fb71fbb69 100644
--- a/app/assets/javascripts/app/views/layout_ref/buttons.jst.eco
+++ b/app/assets/javascripts/app/views/layout_ref/buttons.jst.eco
@@ -5,8 +5,8 @@
   <h3>Default</h3>
   <div class="btn">Default Button</div>
   <div class="btn btn--slim">Slim Button</div>
-  <div class="btn is-disabled">Disabled Button</div>
-  <div class="btn" disabled>Disabled Button</div>
+  <div class="btn is-disabled">Disabled Button (via .is-disabled)</div>
+  <div class="btn" disabled>Disabled Button (via [disabled])</div>
 
   <h3>Primary</h3>
   <div class="btn btn--primary">Primary Button</div>
diff --git a/app/assets/stylesheets/zammad.css.scss b/app/assets/stylesheets/zammad.css.scss
index 4b9106237..d64301811 100644
--- a/app/assets/stylesheets/zammad.css.scss
+++ b/app/assets/stylesheets/zammad.css.scss
@@ -303,7 +303,7 @@ span[data-tooltip]:hover:before {
   }
 
   &.is-disabled,
-  [disabled] {
+  &[disabled] {
     pointer-events: none;
     cursor: not-allowed;
     opacity: .33;