Stretchy Line Navigation in Nav Folder?

Site URL: https://rust-snail-j236.squarespace.com/

I'm using the Stretchy Line Navigation plugin from Ghost Plugins (quoted below). It works well for the top-level site navigation links, but I would like to also incorporate it into the links in the navigation folder as well. How do I add it to the menu items in the drop-down site menu?

Access password: kyle

.header-nav-item::after {
  content: '';
  background: #000000; //color
  height: 2px; //thickness
  width: 0;
  display: block;
  margin-top: -7px !important;
  transition: width 0.2s; //animation speed
  margin: 0 auto;
}

.header-nav-item:hover::after {
  width: 100%;
}

.header-nav-item--active a {
    background-image: none !important;
}

5 hours ago, kyle00428 said:

Site URL: https://rust-snail-j236.squarespace.com/

I'm using the Stretchy Line Navigation plugin from Ghost Plugins (quoted below). It works well for the top-level site navigation links, but I would like to also incorporate it into the links in the navigation folder as well. How do I add it to the menu items in the drop-down site menu?

Access password: kyle

.header-nav-item::after {
  content: '';
  background: #000000; //color
  height: 2px; //thickness
  width: 0;
  display: block;
  margin-top: -7px !important;
  transition: width 0.2s; //animation speed
  margin: 0 auto;
}

.header-nav-item:hover::after {
  width: 100%;
}

.header-nav-item--active a {
    background-image: none !important;
}

 

Try adding to Home > Design > Custom Css

.header-nav-folder-content .header-nav-folder-item {
  position: relative;
}

.header-nav-folder-content .header-nav-folder-item:after {
  content: '';
  background: #000;
  height: 2px;
  width: 0;
  display: block;
  transition: width .2s;
  margin: 0 auto;
  left: 50%;
  transform: translateX(-50%);
  position: absolute;
  max-width: 100%;
}

.header-nav-folder-content .header-nav-folder-item:hover:after {
  width: 100%;
}

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