Border instead of hr

app/assets/stylesheets/pages/members.scss

+.project-members-title {
+  padding-bottom: 10px;
+  border-bottom: 1px solid $border-color;
+}
+
 .member {
   .list-item-name {
     float: none;

app/views/projects/project_members/index.html.haml

 - page_title "Members"
 
 .project-members-page.prepend-top-default
-  %h4.clearfix
+  %h4.project-members-title.clearfix
     Members
     = link_to "Import", import_namespace_project_project_members_path(@project.namespace, @project), class: "btn btn-default pull-right hidden-xs", title: "Import members from another project"
-  %hr
   - if can?(current_user, :admin_project_member, @project)
     .project-members-new.append-bottom-default
       %p.clearfix