diff --git a/main/user/subscribe_user.php b/main/user/subscribe_user.php
index 4ab3017592..2f249fed63 100644
--- a/main/user/subscribe_user.php
+++ b/main/user/subscribe_user.php
@@ -613,7 +613,7 @@ function email_filter($email) {
  */
 function reg_filter($user_id) {
 	if(isset($_REQUEST['type']) && $_REQUEST['type']=='teacher') $type='teacher'; else $type='student';
-	$result = '<a class="btn btn-small" href="'.api_get_self().'?register=yes&type='.$type.'&user_id='.$user_id.'">'.get_lang("reg").'</a>';
+	$result = '<a class="btn btn-small btn-primary" href="'.api_get_self().'?register=yes&type='.$type.'&user_id='.$user_id.'">'.get_lang("reg").'</a>';
 	return $result;
 }
 
diff --git a/main/user/user.php b/main/user/user.php
index a113b8a5ed..276457aa83 100644
--- a/main/user/user.php
+++ b/main/user/user.php
@@ -635,7 +635,7 @@ function modify_filter($user_id) {
         if (api_get_setting('allow_user_course_subscription_by_course_admin') == 'true' or api_is_platform_admin()) {
             // unregister
             if ($user_id != $current_user_id) {
-                $result .= '<a class="btn btn-small" href="'.api_get_self().'?'.api_get_cidreq().'&unregister=yes&amp;user_id='.$user_id.'" title="'.get_lang('Unreg').' " onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('ConfirmYourChoice'),ENT_QUOTES,$charset)).'\')) return false;">'.get_lang('Unreg').'</a>&nbsp;';
+                $result .= '<a class="btn btn-small btn-danger" href="'.api_get_self().'?'.api_get_cidreq().'&unregister=yes&amp;user_id='.$user_id.'" title="'.get_lang('Unreg').' " onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('ConfirmYourChoice'),ENT_QUOTES,$charset)).'\')) return false;">'.get_lang('Unreg').'</a>&nbsp;';
             } else {
                 //$result .= Display::return_icon('unsubscribe_course_na.png', get_lang('Unreg'),'',ICON_SIZE_SMALL).'</a>&nbsp;';
             }
@@ -644,7 +644,7 @@ function modify_filter($user_id) {
         //Show buttons for unsubscribe
         if ($course_info['unsubscribe'] == 1) {
             if ($user_id == $current_user_id) {
-                $result .= '<a class="btn" href="'.api_get_self().'?'.api_get_cidreq().'&unregister=yes&amp;user_id='.$user_id.'" title="'.get_lang('Unreg').' " onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('ConfirmYourChoice'),ENT_QUOTES,$charset)).'\')) return false;">'.get_lang('Unreg').'</a>&nbsp;';
+                $result .= '<a class="btn btn-small btn-danger" href="'.api_get_self().'?'.api_get_cidreq().'&unregister=yes&amp;user_id='.$user_id.'" title="'.get_lang('Unreg').' " onclick="javascript:if(!confirm(\''.addslashes(api_htmlentities(get_lang('ConfirmYourChoice'),ENT_QUOTES,$charset)).'\')) return false;">'.get_lang('Unreg').'</a>&nbsp;';
             }
         }        
     }