diff --git a/app/views/admin/users/_user_detail_note.html.haml b/app/views/admin/users/_user_detail_note.html.haml
index cc4827327c9..c8625833a70 100644
--- a/app/views/admin/users/_user_detail_note.html.haml
+++ b/app/views/admin/users/_user_detail_note.html.haml
@@ -1,7 +1,7 @@
 - if @user.note.present?
   - text = @user.note
-  .card
-    .card-header
+  = render Pajamas::CardComponent.new(card_options: { class: 'gl-mb-5' }, body_options: { class: 'gl-pb-0'}) do |c|
+    - c.header do
       = _('Admin Note')
-    .card-body
+    - c.body do
       %p= text
diff --git a/spec/requests/api/admin/batched_background_migrations_spec.rb b/spec/requests/api/admin/batched_background_migrations_spec.rb
index f4767a87d30..3b396a91d3e 100644
--- a/spec/requests/api/admin/batched_background_migrations_spec.rb
+++ b/spec/requests/api/admin/batched_background_migrations_spec.rb
@@ -9,6 +9,7 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
   describe 'GET /admin/batched_background_migrations/:id' do
     let!(:migration) { create(:batched_background_migration, :paused) }
     let(:database) { :main }
+    let(:params) { { database: database } }
 
     subject(:show_migration) do
       get api("/admin/batched_background_migrations/#{migration.id}", admin), params: { database: database }
@@ -27,10 +28,8 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
     end
 
     context 'when the batched background migration does not exist' do
-      let(:params) { { database: database } }
-
       it 'returns 404' do
-        put api("/admin/batched_background_migrations/#{non_existing_record_id}", admin), params: params
+        get api("/admin/batched_background_migrations/#{non_existing_record_id}", admin), params: params
 
         expect(response).to have_gitlab_http_status(:not_found)
       end
@@ -58,6 +57,17 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
         expect(response).to have_gitlab_http_status(:forbidden)
       end
     end
+
+    context 'when the database name does not exist' do
+      let(:database) { :wrong_database }
+
+      it 'returns bad request' do
+        get api("/admin/batched_background_migrations/#{migration.id}", admin), params: params
+
+        expect(response).to have_gitlab_http_status(:bad_request)
+        expect(response.body).to include('database does not have a valid value')
+      end
+    end
   end
 
   describe 'GET /admin/batched_background_migrations' do
@@ -82,6 +92,7 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
         let(:database) { :ci }
         let(:schema) { :gitlab_ci }
         let(:ci_model) { Ci::ApplicationRecord }
+        let(:params) { { database: database } }
 
         context 'when CI database is provided' do
           let(:db_config) { instance_double(ActiveRecord::DatabaseConfigurations::HashConfig, name: 'fake_db') }
@@ -94,7 +105,18 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
 
             expect(Gitlab::Database::SharedModel).to receive(:using_connection).with(ci_model.connection).and_yield
 
-            get api('/admin/batched_background_migrations', admin), params: { database: :ci }
+            get api('/admin/batched_background_migrations', admin), params: params
+          end
+
+          context 'when the database name does not exist' do
+            let(:database) { :wrong_database }
+
+            it 'returns bad request' do
+              get api("/admin/batched_background_migrations", admin), params: params
+
+              expect(response).to have_gitlab_http_status(:bad_request)
+              expect(response.body).to include('database does not have a valid value')
+            end
           end
 
           it 'returns CI database records' do
@@ -105,7 +127,7 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
               create(:batched_background_migration, :active, gitlab_schema: schema)
             end
 
-            get api('/admin/batched_background_migrations', admin), params: { database: :ci }
+            get api('/admin/batched_background_migrations', admin), params: params
 
             aggregate_failures "testing response" do
               expect(response).to have_gitlab_http_status(:ok)
@@ -133,9 +155,10 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
   describe 'PUT /admin/batched_background_migrations/:id/resume' do
     let!(:migration) { create(:batched_background_migration, :paused) }
     let(:database) { :main }
+    let(:params) { { database: database } }
 
     subject(:resume) do
-      put api("/admin/batched_background_migrations/#{migration.id}/resume", admin), params: { database: database }
+      put api("/admin/batched_background_migrations/#{migration.id}/resume", admin), params: params
     end
 
     it 'pauses the batched background migration' do
@@ -149,8 +172,6 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
     end
 
     context 'when the batched background migration does not exist' do
-      let(:params) { { database: database } }
-
       it 'returns 404' do
         put api("/admin/batched_background_migrations/#{non_existing_record_id}/resume", admin), params: params
 
@@ -160,7 +181,6 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
 
     context 'when the migration is not paused' do
       let!(:migration) { create(:batched_background_migration, :failed) }
-      let(:params) { { database: database } }
 
       it 'returns 422' do
         put api("/admin/batched_background_migrations/#{migration.id}/resume", admin), params: params
@@ -182,6 +202,17 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
 
         resume
       end
+
+      context 'when the database name does not exist' do
+        let(:database) { :wrong_database }
+
+        it 'returns bad request' do
+          put api("/admin/batched_background_migrations/#{migration.id}/resume", admin), params: params
+
+          expect(response).to have_gitlab_http_status(:bad_request)
+          expect(response.body).to include('database does not have a valid value')
+        end
+      end
     end
 
     context 'when authenticated as a non-admin user' do
@@ -195,9 +226,11 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
 
   describe 'PUT /admin/batched_background_migrations/:id/pause' do
     let!(:migration) { create(:batched_background_migration, :active) }
+    let(:database) { :main }
+    let(:params) { { database: database } }
 
     it 'pauses the batched background migration' do
-      put api("/admin/batched_background_migrations/#{migration.id}/pause", admin), params: { database: :main }
+      put api("/admin/batched_background_migrations/#{migration.id}/pause", admin), params: params
 
       aggregate_failures "testing response" do
         expect(response).to have_gitlab_http_status(:ok)
@@ -207,8 +240,6 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
     end
 
     context 'when the batched background migration does not exist' do
-      let(:params) { { database: :main } }
-
       it 'returns 404' do
         put api("/admin/batched_background_migrations/#{non_existing_record_id}/pause", admin), params: params
 
@@ -218,7 +249,6 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
 
     context 'when the migration is not active' do
       let!(:migration) { create(:batched_background_migration, :failed) }
-      let(:params) { { database: :main } }
 
       it 'returns 422' do
         put api("/admin/batched_background_migrations/#{migration.id}/pause", admin), params: params
@@ -229,6 +259,7 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
 
     context 'when multiple database is enabled' do
       let(:ci_model) { Ci::ApplicationRecord }
+      let(:database) { :ci }
 
       before do
         skip_if_multiple_databases_not_setup
@@ -237,7 +268,18 @@ RSpec.describe API::Admin::BatchedBackgroundMigrations do
       it 'uses the correct connection' do
         expect(Gitlab::Database::SharedModel).to receive(:using_connection).with(ci_model.connection).and_yield
 
-        put api("/admin/batched_background_migrations/#{migration.id}/pause", admin), params: { database: :ci }
+        put api("/admin/batched_background_migrations/#{migration.id}/pause", admin), params: params
+      end
+
+      context 'when the database name does not exist' do
+        let(:database) { :wrong_database }
+
+        it 'returns bad request' do
+          put api("/admin/batched_background_migrations/#{migration.id}/pause", admin), params: params
+
+          expect(response).to have_gitlab_http_status(:bad_request)
+          expect(response.body).to include('database does not have a valid value')
+        end
       end
     end