diff --git a/IPython/html/static/auth/js/loginwidget.js b/IPython/html/static/auth/js/loginwidget.js
index 8d9f5a2..89c2f57 100644
--- a/IPython/html/static/auth/js/loginwidget.js
+++ b/IPython/html/static/auth/js/loginwidget.js
@@ -19,9 +19,7 @@ define([
         }
     };
 
-    LoginWidget.prototype.style = function () {
-        this.element.find("button").addClass("btn btn-default btn-sm");
-    };
+    LoginWidget.prototype.style = function () {};
 
 
     LoginWidget.prototype.bind_events = function () {
@@ -44,4 +42,4 @@ define([
     IPython.LoginWidget = LoginWidget;
 
     return {'LoginWidget': LoginWidget};
-});
\ No newline at end of file
+});
diff --git a/IPython/html/static/base/less/page.less b/IPython/html/static/base/less/page.less
index cbae3d4..dde053f 100644
--- a/IPython/html/static/base/less/page.less
+++ b/IPython/html/static/base/less/page.less
@@ -71,6 +71,12 @@ span#login_widget {
     float: right;
 }
 
+span#login_widget > .button {
+    .btn();
+    .btn-default();
+    .btn-sm();
+}
+
 .nav-header {
     text-transform: none;
 }