Mobile menu css code from a Squarespace website that I want the same mobile nav.

Site URL: https://www.ztfmediagroup.com

Hi all,

I know that another website that uses Squarespace: https://www.blackponcho.co.uk .

And on mobile I absolutely love the mobile navigation and I am wondering if anybody know the css code or the plug-in for the navigation, and I also like the desktop navigation they have on desktop. Also the hamburger menu icon is bolder and hassle different colour which I would like to have the same for my site.
 

any help appreciated, here is my site: https://www.ztf-media.com 

Thanks,

Zak