Method addCss

packages/core/ui/styling/style-scope.ts:851–853

(cssString: string, cssFileName?: string)

	}

	public addCss(cssString: string, cssFileName?: string): void {
		this.appendCss(cssString, cssFileName);
	}

	public addCssFile(cssFileName: string): void {
		this.appendCss(null, cssFileName);