Remove menu bullet points in mobile view

Hello,

I would need some help.

I would like to remove the bullet points/signs at my webshop’s main menu. These bullet points are only visible in mobile view.

I have tried several css codes, but nothing works.

Here is a picture about the problem:

https://drive.google.com/open?id=1DI0M6liqdgbv-0CsqD93EKiOVgt8_LXS

Could somebody helps please?

Thank you for the help in advance!

Regards,

Janos

The page I need help with: [log in to see the link]