Update button styles for Milestones#show

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

@@ -20,16 +20,16 @@
   .pull-right
     - if can?(current_user, :admin_milestone, @project)
       - if @milestone.active?
-        = link_to 'Close Milestone', namespace_project_milestone_path(@project.namespace, @project, @milestone, milestone: {state_event: :close }), method: :put, class: "btn btn-close btn-grouped"
+        = link_to 'Close Milestone', namespace_project_milestone_path(@project.namespace, @project, @milestone, milestone: {state_event: :close }), method: :put, class: "btn btn-close btn-nr btn-grouped"
       - else
-        = link_to 'Reopen Milestone', namespace_project_milestone_path(@project.namespace, @project, @milestone, milestone: {state_event: :activate }), method: :put, class: "btn btn-reopen btn-grouped"
+        = link_to 'Reopen Milestone', namespace_project_milestone_path(@project.namespace, @project, @milestone, milestone: {state_event: :activate }), method: :put, class: "btn btn-reopen btn-nr btn-grouped"
 
-      = link_to namespace_project_milestone_path(@project.namespace, @project, @milestone), data: { confirm: 'Are you sure?' }, method: :delete, class: "btn btn-grouped btn-remove" do
-        %i.fa.fa-trash-o
+      = link_to namespace_project_milestone_path(@project.namespace, @project, @milestone), data: { confirm: 'Are you sure?' }, method: :delete, class: "btn btn-grouped btn-nr btn-remove" do
+        = icon('trash-o')
         Delete
 
-      = link_to edit_namespace_project_milestone_path(@project.namespace, @project, @milestone), class: "btn btn-grouped" do
-        %i.fa.fa-pencil-square-o
+      = link_to edit_namespace_project_milestone_path(@project.namespace, @project, @milestone), class: "btn btn-grouped btn-nr" do
+        = icon('pencil-square-o')
         Edit
 
 .detail-page-description.gray-content-block.second-block