:local {
  .clinical-lowlight-theme {
    --terra-dev-site-collapsing-navigation-menu-item-background-color: #1c2326;
    --terra-dev-site-collapsing-navigation-menu-item-hover-background-color: #1c2326;
    --terra-dev-site-collapsing-navigation-menu-item-focus-outline: #fff;
  }
}