diff --git a/addthis_displays/addthis_displays.addthis.inc b/addthis_displays/addthis_displays.addthis.inc
index 4c02e84..3c8c74e 100644
--- a/addthis_displays/addthis_displays.addthis.inc
+++ b/addthis_displays/addthis_displays.addthis.inc
@@ -25,7 +25,7 @@ function addthis_displays_addthis_display_markup__addthis_basic_toolbox($options
       'class' => array(
         'addthis_toolbox',
         'addthis_default_style',
-        ($options['#display']['settings']['buttons_size'] == AddThis::CSS_32x32 ? AddThis::CSS_32x32 : NULL),
+        $options['#display']['settings']['buttons_size'],
         $options['#display']['settings']['extra_css'],
       ),
     ),
diff --git a/addthis_displays/addthis_displays.field.inc b/addthis_displays/addthis_displays.field.inc
index 1ee9106..828cf64 100644
--- a/addthis_displays/addthis_displays.field.inc
+++ b/addthis_displays/addthis_displays.field.inc
@@ -61,6 +61,7 @@ function addthis_displays_field_formatter_settings_form($field, $instance, $view
         '#default_value' => $settings['buttons_size'],
         '#options' => array(
           AddThis::CSS_16x16 => t('Small (16x16)'),
+          AddThis::CSS_20x20 => t('Medium (20x20)'),
           AddThis::CSS_32x32 => t('Big (32x32)'),
         ),
       );
diff --git a/classes/AddThis.php b/classes/AddThis.php
index c558a8e..96387a2 100644
--- a/classes/AddThis.php
+++ b/classes/AddThis.php
@@ -71,6 +71,7 @@ class AddThis {
 
   // Styles.
   const CSS_32x32 = 'addthis_32x32_style';
+  const CSS_20x20 = 'addthis_20x20_style';
   const CSS_16x16 = 'addthis_16x16_style';
 
   private static $instance;