diff --git a/templates/default/join.html.ep b/templates/default/join.html.ep
index eedd622..5fcda74 100644
--- a/templates/default/join.html.ep
+++ b/templates/default/join.html.ep
@@ -94,15 +94,17 @@
           </button>
           <ul class="dropdown-menu" role="menu" aria-labelledby="confMenuButton" id="confMenu">
             <li>
-              <div class="navbar-form">
-                <div class="btn-group" data-toggle="buttons">
-                  <label class="btn btn-default<%= $locked eq 'checked' ? ' btn-danger':'' %> help" id="lockLabel" data-toggle="tooltip" data-placement="bottom" title="<%=l 'PREVENT_TO_JOIN' %>">
-                    <input type="checkbox" id="lockButton" <%= $locked %>>
-                    <span class="glyphicon glyphicon-lock">
-                    </span>
-                  </label>
+              <center>
+                <div class="navbar-form">
+                  <div class="btn-group" data-toggle="buttons">
+                    <label class="btn btn-default<%= $locked eq 'checked' ? ' btn-danger':'' %> help" id="lockLabel" data-toggle="tooltip" data-placement="bottom" title="<%=l 'PREVENT_TO_JOIN' %>">
+                      <input type="checkbox" id="lockButton" <%= $locked %>>
+                      <span class="glyphicon glyphicon-lock">
+                      </span>
+                    </label>
+                  </div>
                 </div>
-              </div>
+              </center>
             </li>
             <li class="divider"></li>
             <li>