Copy slide out menu from this site

Ok, I have gotten this far, now I am stuck.

https://bridgepointrelief.luvilay3-liquidwebsites.com/

Which part are you specifically wanting to copy? How it's constantly slightly visible on the far left?

Hi Tom,

Yes the visibility and having it as the menu on the side, I have already created the blank primary menu in GP menu settings.

Any ideas?

Give this a shot:

#site-navigation {
    position: fixed;
    left: 0;
    height: 100vh;
    top: 0;
}