diff --git a/layouts/partials/sidebar.html b/layouts/partials/sidebar.html
index 6d6449a..3692fd2 100644
--- a/layouts/partials/sidebar.html
+++ b/layouts/partials/sidebar.html
@@ -14,15 +14,16 @@
 <li><a href="https://unshort.nolog.cz">unshort.nolog.cz</a></li>
 <li><a href="https://acab.link">acab.link</a>/<a href="https://nolog.link">nolog.link</a></li>
 </ul>
-<form method="post" action="https://newsletter.nolog.cz/subscription/form" class="listmonk-form">
-    <div>
+
+<hr>
+
+<form class="contact-form" method="post" action="https://newsletter.nolog.cz/subscription/form" class="listmonk-form">
         <h4>Newsletter</h4>
-        <p><input type="text" name="email" placeholder="E-mail" /></p>
+        <p><input type="text" name="email" placeholder="e-mail" /></p>
         <p>
           <input hidden checked id="f9429" type="checkbox" name="l" value="f942970d-1da9-4cc7-82c6-b2056edb57de" />
         </p>
-        <p><input type="submit" value="Subscribe" /></p>
-    </div>
+        <p><input style="background: #333333;color: white;border: none;" class="form-submit" type="submit" value="Subscribe" /></p>
 </form>
 </section>
 </aside>
diff --git a/themes/zen b/themes/zen
index ec9d656..437d160 160000
--- a/themes/zen
+++ b/themes/zen
@@ -1 +1 @@
-Subproject commit ec9d6563dd0e3480d8652e30f9d17732111798ad
+Subproject commit 437d16084792e45f9dbcfa8a2c14086e8b8f10cb