I would like to ask for help with the mobile view of a Wordpress website. I’ve been struggling to find a way to replace the menu button with the simple, always-expanded items. I would highly appreciate any advice.

I don’t have access to editing my theme (‘Twenty Twelve’) because of tight hosting controls in my institutions. I do have access to the ‘Additional CSS’ option, which can go quite a long way, after all–and I hope so too for this matter.

Website for which I'm requesting advice: PROSPR | Promoting Open Science Practices

Thank you very much,