mootools navigation extension

Using mootoolsnav extension with Music Academy sample website.
Want to remove the default bullets for the accordion nav menu.(see attached picture)
Know how to do this in CSS.
Please advise how I can do this for the mootoolsnav extension.

thanks

Found the answer!
Added a class with the relevant style info to the core css file through the backend, and declared the class in the module (mootoolsnav) specs.