Consistent button colors for disabled buttons

app/assets/stylesheets/framework/dropdowns.scss

@@ -43,7 +43,7 @@
   white-space: nowrap;
 
   &[disabled] {
-    background-color: $input-bg-disabled;
+    opacity: .65;
     cursor: not-allowed;
   }
 

app/assets/stylesheets/pages/merge_requests.scss

@@ -24,10 +24,6 @@
         color: inherit;
       }
 
-      .btn-success.dropdown-toggle:disabled {
-        background-color: $gl-success;
-      }
-
       .accept-merge-request {
         &.ci-pending,
         &.ci-running {

changelogs/unreleased/29263-merge-button-color.yml

+---
+title: ensure MR widget dropdown is same color as button
+merge_request:
+author: