How to change font of navigation menu

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

My code thus far

@font-face {
    font-family: 'Weiss';
       src: url('https://static1.squarespace.com/static/5ef669d3c371a62deb2272b9/t/5f0c93c88d922a7cb17d2a84/1594659784298/WeissStd.otf');
  }
h1 {font-family: 'Weiss';}
h2 {font-family: 'Weiss';}
h3 {font-family: 'Weiss';}
h4 {font-family: 'Weiss';}
P {font-family: 'Weiss';}

Add to Home > Design > Custom CSS

nav.header-menu-nav-list *, .header-nav * {
    font-family: 'Weiss' !important;
}