Toggling menu for desktop NOT mobile

Hi,

I’m currently customising the hexa theme for a blog: https://lanishamash.com/

I’ve added some additional CSS so that the main menu is toggled and have unchecked the box for the custom CSS to be included in the mobile theme. However, the menu still appears toggled in mobile view (rather than the desired hamburger).

Here’s the CSS:
‘.panel#menu-toggle-nav {
display: block;’

Any advice on how to edit the CSS and provide a different view from desktop to mobile?

Thanks,