.navbar-nav .nav-link { font-weight: 400 !important; text-transform: none !important }
  .btn.text-uppercase { text-transform: none !important }

  #navbarNavDropdown li.nav-item > ul.navbar-nav { display: none; }
  #navbarNavDropdown li.nav-item.open > ul.navbar-nav { display: block; }

  #navbarNavDropdown > ul.navbar-nav > li.nav-item { border-bottom: 1px solid rgba(255,255,255,.25); padding-bottom: 1rem; margin-bottom: .5rem; }
  #navbarNavDropdown > ul.navbar-nav > li.nav-item:last-child { border-bottom: 0; }
  #navbarNavDropdown > ul.navbar-nav > li.nav-item > a { display: block; text-align: center; }
  #navbarNavDropdown > ul.navbar-nav > li.nav-item > a::after { content: ""; display: block; width: .5em; height: .5em; margin: .35em auto 0; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg); transition: transform .2s; }
  #navbarNavDropdown > ul.navbar-nav > li.nav-item.open > a::after { transform: rotate(-135deg); }