diff --git a/dialogs/btbutton.js b/dialogs/btbutton.js
index 24bea1d..9be3db7 100755
--- a/dialogs/btbutton.js
+++ b/dialogs/btbutton.js
@@ -27,7 +27,10 @@ CKEDITOR.dialog.add('btbutton', function (editor) {
                                     [lang.buttonSuccess, 'btn-success'],
                                     [lang.buttonInfo, 'btn-info'],
                                     [lang.buttonWarning, 'btn-warning'],
-                                    [lang.buttonDanger, 'btn-danger']
+                                    [lang.buttonDanger, 'btn-danger'],
+                                    [lang.buttonDark, 'btn-dark'],
+                                    [lang.buttonLight, 'btn-light'],
+
                                 ],
                                 setup: function (widget) {
                                     this.setValue(widget.data.btntype || 'btn-default');
@@ -41,7 +44,6 @@ CKEDITOR.dialog.add('btbutton', function (editor) {
                                 type: 'select',
                                 label: lang.buttonSizeLabel,
                                 items: [
-                                    [lang.buttonSizeExSmall, 'btn-xs'],
                                     [lang.buttonSizeSmall, 'btn-sm'],
                                     [lang.buttonSizeNormal, ''],
                                     [lang.buttonSizeLarge, 'btn-lg']
diff --git a/plugin.js b/plugin.js
index 14e75fd..1801a4d 100644
--- a/plugin.js
+++ b/plugin.js
@@ -38,11 +38,13 @@
                         this.data.btntype = "btn-warning";
                       } else if ($el.hasClass("btn-danger")) {
                         this.data.btntype = "btn-danger";
+                      } else if ($el.hasClass("btn-dark")) {
+                        this.data.btntype = "btn-dark";
+                      } else if ($el.hasClass("btn-light")) {
+                        this.data.btntype = "btn-light";
                       }
 
-                      if ($el.hasClass("btn-xs")) {
-                        this.data.btnsize = "btn-xs";
-                      } else if ($el.hasClass("btn-sm")) {
+                      if ($el.hasClass("btn-sm")) {
                         this.data.btnsize = "btn-sm";
                       } else if ($el.hasClass("btn-lg")) {
                         this.data.btnsize = "btn-lg";