I cannot change the style of WP spoiler in the widget

HI I am using the WP UI for posts as the widget and I cannot change the default style and there appears bullets on all the spoilers. Could anyone help me solve this problem ? The page where I am using the WP spoiler is http://www.nepal-kathmandu.com/pokhara.php. It is on the sidebar widget. Thank you

Jdbaba

http://wordpress.org/extend/plugins/wp-ui/