Add Flash spacing on merge request show page

app/assets/stylesheets/pages/merge_requests.scss

@@ -1033,3 +1033,9 @@ $mr-widget-min-height: 69px;
 .diff-file-row.is-active {
   background-color: $gray-50;
 }
+
+.merge-request-container {
+  .flash-container {
+    @include gl-mb-4;
+  }
+}

app/views/projects/merge_requests/show.html.haml

 - @gfm_form = true
-- @content_class = "limit-container-width" unless fluid_layout
+- @content_class = "merge-request-container#{' limit-container-width' unless fluid_layout}"
 - add_to_breadcrumbs _("Merge Requests"), project_merge_requests_path(@project)
 - breadcrumb_title @merge_request.to_reference
 - page_title "#{@merge_request.title} (#{@merge_request.to_reference})", _("Merge Requests")

changelogs/unreleased/add-flash-spacing-on-merge-request.yml

+---
+title: Add Flash spacing on merge request show page
+merge_request: 39903
+author:
+type: changed