change an icon-position to center

src/server/views/widget/page_tabs.html

@@ -79,7 +79,7 @@
       </div>
     </li>
     {% else %}
-    <li class="nav-item dropdown">
+    <li class="nav-item dropdown d-flex align-items-center">
       <a
         {% if user %} role="button" data-toggle="dropdown" {% endif %}
         {% if not user %}