diff --git a/core/admin/assets/assets/app.css b/core/admin/assets/assets/app.css
index 84644900..a25a4cfb 100644
--- a/core/admin/assets/assets/app.css
+++ b/core/admin/assets/assets/app.css
@@ -57,3 +57,9 @@ fieldset:disabled .form-control:disabled {
 .input-group-text {
   margin-right: 1em;
 }
+
+/* version string */
+.mailu-version {
+  font-size: 60%;
+  line-height: 0;
+}
diff --git a/core/admin/mailu/ui/templates/base.html b/core/admin/mailu/ui/templates/base.html
index f351f719..6484b355 100644
--- a/core/admin/mailu/ui/templates/base.html
+++ b/core/admin/mailu/ui/templates/base.html
@@ -78,7 +78,11 @@
           <i class="fa fa-code-branch" aria-hidden="true"></i><span class="sr-only">fork</span>
           on <a href="https://github.com/Mailu/Mailu">Github</a>
         </span>
-        <div style="font-size:60%;line-height:0"><span class="fa-pull-right">{{ config["MAILU_VERSION"] }}</span></div>
+        <div class="mailu-version">
+          <span class="fa-pull-right">
+            {{ config["MAILU_VERSION"] }}
+          </span>
+        </div>
       </footer>
     </div>
     <script src="{{ url_for('static', filename='vendor.js') }}"></script>