Angular 2 - PrimeNg style not working

I resolve my problem by remove rel="stylesheet" type="text/css" from index.html and also added below imports to styles.css :

@import '~primeicons/primeicons.css';
@import '~primeng/resources/themes/nova-light/theme.css';
@import '~primeng/resources/primeng.min.css';

I found a tutorial that uses PrimeNg with Angular CLI that worked for me.

I added the font-awesome.min.css stylesheet to index.html.

Then the theme I wanted (e.g. "../node_modules/primeng/resources/themes/omega/theme.css",) to angular-cli.json file in the "styles" [...] section.