If you’re using ViewEncapsulation value which is different than default, it might be daunting to set the value manually for every component.

Luckily you can configure it globally when bootstrapping your app:

platformBrowserDynamic().bootstrapModule(AppModule, [
    // NOTE: Use ViewEncapsulation.None only if you know what you're doing.
    defaultEncapsulation: ViewEncapsulation.None

继续阅读 30秒学会 Angular 片段 – Default ViewEncapsulation value