naive-ui/styles/themes/light/components/Tree.scss

@mixin setup-light-tree {
  $--tree-node-background-color: (
    'hover': change-color($--n-primary-color, $alpha: .16),
    'active': change-color($--n-primary-color, $alpha: .1),
    'selected': change-color($--n-primary-color, $alpha: .1)
  ) !global;
  $--tree-node-switcher-color: $--n-tertiary-text-color !global;
}