gae/frontend/src/app/shared/navbar/_navbar-theme.scss

@mixin nav-bar-theme($theme) {
  $primary: map-get($theme, primary);
  $accent: map-get($theme, accent);
  $warn: map-get($theme, warn);
  $background: map-get($theme, background);
  $foreground: map-get($theme, foreground);

  mat-toolbar.main-toolbar {
    .mat-list-item {
      color: mat-color($primary, '600-contrast') !important;
    }
  }
}