Update styles.css

Author: garrodonnell

1-Authentication/2-sign-in-angular/SPA/src/styles.css

@@ -1,4 +1,3 @@
-/* You can add global styles to this file, and also import other style files */
-
+@import '~@angular/material/prebuilt-themes/deeppurple-amber.css';
 html, body { height: 100%; }
 body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }