diff --git a/e107_plugins/pm/e_shortcode.php b/e107_plugins/pm/e_shortcode.php
index 9686205dd..99e4fdaa8 100644
--- a/e107_plugins/pm/e_shortcode.php
+++ b/e107_plugins/pm/e_shortcode.php
@@ -103,7 +103,7 @@ class pm_shortcodes extends e_shortcode
 		$pm = new private_message;
 
 		$glyph  = empty($parm['glyph']) ? 'fa-paper-plane' : $parm['glyph'];
-		$class  = empty($parm['class']) ? 'btn btn-sm btn-default' : $parm['class'];
+		$class  = empty($parm['class']) ? 'btn btn-sm btn-default btn-secondary' : $parm['class'];
 
 
 		if(check_class($pm_prefs['pm_class']) && $pm->canSendTo($parm['user'])) // check $this->pmPrefs['send_to_class'].
diff --git a/e107_plugins/pm/pm_shortcodes.php b/e107_plugins/pm/pm_shortcodes.php
index a75b13709..5a8bc00ef 100644
--- a/e107_plugins/pm/pm_shortcodes.php
+++ b/e107_plugins/pm/pm_shortcodes.php
@@ -562,7 +562,7 @@ if(!class_exists('plugin_pm_pm_shortcodes'))
 			{
 				$icon = (deftrue('FONTAWESOME')) ? e107::getParser()->toGlyph('fa-user-times','fw=1') : "<img src='".e_PLUGIN_ABS."pm/images/mail_block.png'  alt='".LAN_PM_50."' class='icon S16' />";
 
-				return "<a class='btn  btn-default' href='".$this->url('action/block', 'id='.$this->var['pm_from'])."' title='".LAN_PM_50."'>".$icon."</a>";
+				return "<a class='btn  btn-default btn-secondary' href='".$this->url('action/block', 'id='.$this->var['pm_from'])."' title='".LAN_PM_50."'>".$icon."</a>";
 			}
 		}
 
@@ -586,7 +586,7 @@ if(!class_exists('plugin_pm_pm_shortcodes'))
 
 
 			$action = $extra == '.outbox' ? 'delete-out' : 'delete-in';
-			return "<a class='btn btn-default' title='".LAN_DELETE."' href='".$this->url('action/'.$action, 'id='.$this->var['pm_id'])."'>".PM_DELETE_ICON."</a>";
+			return "<a class='btn btn-default btn-secondary' title='".LAN_DELETE."' href='".$this->url('action/'.$action, 'id='.$this->var['pm_id'])."'>".PM_DELETE_ICON."</a>";
 		}
 
 
diff --git a/e107_plugins/pm/templates/pm_menu_template.php b/e107_plugins/pm/templates/pm_menu_template.php
index 88c814c66..d63f39183 100644
--- a/e107_plugins/pm/templates/pm_menu_template.php
+++ b/e107_plugins/pm/templates/pm_menu_template.php
@@ -58,7 +58,7 @@ $sc_style['PM_BLOCKED_SENDERS_MANAGE']['pre'] = "<br />[ <a href='".e_PLUGIN_ABS
 $sc_style['PM_BLOCKED_SENDERS_MANAGE']['post'] = '</a> ]';
 */
 //$PM_MENU_WRAPPER['PM_SEND_PM_LINK']= "<br /><br />{---}";
-$PM_MENU_WRAPPER['PM_SEND_PM_LINK']= "<a class='btn btn-mini btn-xs btn-default' href='{---}'>".LAN_PLUGIN_PM_NEW."</a>";
+$PM_MENU_WRAPPER['PM_SEND_PM_LINK']= "<a class='btn btn-mini btn-xs btn-default btn-secondary' href='{---}'>".LAN_PLUGIN_PM_NEW."</a>";
 $PM_MENU_WRAPPER['PM_INBOX_FILLED']=$PM_MENU_WRAPPER['PM_OUTBOX_FILLED']= "[{---}%]";
 $PM_MENU_WRAPPER['PM_NEWPM_ANIMATE']= "<a href='".e_PLUGIN_ABS."pm/pm.php?inbox'>{---}</a>";
 $PM_MENU_WRAPPER['PM_BLOCKED_SENDERS_MANAGE']= "<br />[ <a href='".e_PLUGIN_ABS."pm/pm.php?blocked'>{---}</a> ]";