diff --git a/app/views/layouts/application.html.erb b/app/views/layouts/application.html.erb
index 800af6d..cc60bea 100644
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -46,7 +46,7 @@
         <% if content_for?(:page_head) %>
           <div class="row">
             <div class="col-xl-12 col-sm-12">
-              <h1 class="display-4"><%= content_for(:page_head) %></h1>
+              <h1 class="display-4 border-bottom mb-3"><%= content_for(:page_head) %></h1>
             </div>
           </div>
         <% end %>
diff --git a/app/views/shared/settings/show.html.haml b/app/views/shared/settings/show.html.haml
index b307ec0..f195fbb 100644
--- a/app/views/shared/settings/show.html.haml
+++ b/app/views/shared/settings/show.html.haml
@@ -1,6 +1,6 @@
 - page_title t("fluentd.settings.#{target_plugin_name}.show.page_title")
 
-.card
+.card.mb-3
   .card-body.bg-light
     = raw t("fluentd.settings.#{target_plugin_name}.option_guide")