Vertical Line Dividers between Primary Navigation links in Mojave Template

I want to put vertical lines between my primary navigation links but cannot figure out how to do so.

@zande88 Add to Home > Design > Custom CSS

.Header-nav a {
   border-right: 1px solid #000;
   padding-right: 5px !important;
   padding-top: 1px;
   padding-bottom: 1px;
}
.Header-nav a:last-child {
   border: none;
}

@zande88 Have you solved yet? Thanks