twbs--bootstrap/assets/scss/_nav.scss

// scss-lint:disable VendorPrefix

//
// Main navbar
//

.bd-navbar {
  min-height: 4rem;
  background-color: $bd-purple;
  box-shadow: 0 .5rem 1rem rgba(0,0,0,.05), inset 0 -1px 0 rgba(0,0,0,.1);

  @include media-breakpoint-down(md) {
    .navbar-nav-scroll {
      max-width: 100%;
      height: 2.5rem;
      margin-top: .25rem;
      overflow-x: hidden;
      font-size: .875rem;

      .navbar-nav {
        padding-bottom: 2rem;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
      }
    }
  }

  @include media-breakpoint-up(md) {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
    z-index: 1030; // over everything in bootstrap
  }

  .navbar-nav {
    .nav-link {
      padding-right: .5rem;
      padding-left: .5rem;
      color: $bd-purple-light;

      &.active,
      &:hover {
        color: #fff;
        background-color: transparent;
      }

      &.active {
        font-weight: 500;
      }
    }
  }

  .navbar-nav-svg {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    vertical-align: text-top;
  }

  .dropdown-menu {
    font-size: .875rem;
  }
}