diff --git a/themes/cosin-theme/layouts/partials/site-menu.html b/themes/cosin-theme/layouts/partials/site-menu.html
index 1037765..ceb006c 100644
--- a/themes/cosin-theme/layouts/partials/site-menu.html
+++ b/themes/cosin-theme/layouts/partials/site-menu.html
@@ -1,17 +1,15 @@
-<nav class="pv2 ph0 ph0-ns bg-black-30">
+<nav>
   <div id="menu">
-    <div class="flex-l items-center">
-      {{ if .Site.Menus.main }}
-        <ul class="ma0 pl5 pv1">
-          {{ range .Site.Menus.main }}
-          <li class="list f5 f4-ns fw4 dib pr3">
-            <a class="no-underline f4" href="{{ .URL }}" title="{{ .Name }}">
-              {{ .Name }}
-            </a>
-          </li>
-          {{ end }}
-        </ul>
-      {{ end }}
+    <div>
+      <ul>
+        {{ range .Site.Menus.main }}
+        <li>
+          <a href="{{ .URL }}" title="{{ .Name }}">
+            {{ .Name }}
+          </a>
+        </li>
+        {{ end }}
+      </ul>
     </div>
   </div>
 </nav>