diff --git a/layouts/index.html b/layouts/index.html
index 47dd0e2..0f3b9f0 100644
--- a/layouts/index.html
+++ b/layouts/index.html
@@ -11,7 +11,9 @@
             <ul>
             {{ range first 5 (.Data.Pages.GroupByDate "Jan, 2006" "desc")}}
                 {{ $nbPages := len (where .Pages "Section" "blog")}}
-                {{ if ne $nbPages 0}}{{ .Key }}{{ end }}
+                {{ if ne $nbPages 0}}
+                    <li class="groupby">{{ .Key }}</li>
+                {{ end }}
                 {{ range where .Pages.ByPublishDate "Section" "blog"}}
                     {{ partial "li.html" . }}
                 {{ end }}
diff --git a/layouts/section/blog.html b/layouts/section/blog.html
index ff6baa4..bd20396 100644
--- a/layouts/section/blog.html
+++ b/layouts/section/blog.html
@@ -5,7 +5,7 @@
             <div class="page-heading">Blog</div>
             <ul>
                 {{ range .Data.Pages.GroupByDate "Jan, 2006" "desc"}}
-                    {{ .Key }}
+                    <li class="groupby">{{ .Key }}</li>
                     {{ range .Pages.ByPublishDate }}
                         {{ partial "li.html" . }}
                     {{ end }}
diff --git a/static/css/main.css b/static/css/main.css
index 7968340..6263952 100644
--- a/static/css/main.css
+++ b/static/css/main.css
@@ -490,6 +490,10 @@ section.main .container.f04 .content .detail {
     margin-bottom: 30px;
   }
 }
+section.main .container .content .groupby {
+  margin-top: 1em;
+  padding-left: 0.5em;
+}
 section.main .container .content .post-item {
   display: -webkit-flex;
   display: -moz-flex;