ngx-admin/src/app/@theme/components/base-header/_base-header.component.theme.scss

@mixin base-header-theme($theme-name) {
  /deep/ base-header {
    .logo > a {
      color: $nga-color-secondary !important;

      @include hover-focus-active {
        color: $nga-color-inverse !important;
      }
    }

    .left > *,
    .right > * {
      border-color: rgba($nga-color-inverse, 0.2);
    }
  }
}