setup scss for styles

.angular-cli.json

@@ -68,7 +68,7 @@
     }
   },
   "defaults": {
-    "styleExt": "css",
+    "styleExt": "scss",
     "component": {}
   }
 }

src/app/app.component.ts

@@ -3,7 +3,7 @@ import { Component } from '@angular/core';
 @Component({
   selector: 'app-root',
   templateUrl: './app.component.html',
-  styleUrls: ['./app.component.css']
+  styleUrls: ['./app.component.scss']
 })
 export class AppComponent {
   title = 'app';