lib/generators/css_zero/add/templates/app/assets/stylesheets/zcombobox.css in css-zero-0.0.52 vs lib/generators/css_zero/add/templates/app/assets/stylesheets/zcombobox.css in css-zero-0.0.53

@@ -37,9 +37,10 @@
   .optgroup {
     padding: var(--size-1);
   }
 
   .optgroup-header {
+    background-color: inherit;
     color: var(--color-text-subtle);
     font-size: var(--text-xs);
     padding: var(--size-1_5) var(--size-2);
   }