updated styles.css to styles.scss in angular.json

angular.json

@@ -24,7 +24,7 @@
               "src/backend"
             ],
             "styles": [
-              "src/styles.css"
+              "src/styles.scss"
             ],
             "scripts": []
           },
@@ -74,7 +74,7 @@
             "tsConfig": "src/tsconfig.spec.json",
             "scripts": [],
             "styles": [
-              "src/styles.css"
+              "src/styles.scss"
             ],
             "assets": [
               "src/assets",
@@ -125,7 +125,7 @@
   "schematics": {
     "@schematics/angular:component": {
       "prefix": "app",
-      "styleext": "css"
+      "styleext": "scss"
     },
     "@schematics/angular:directive": {
       "prefix": "app"