message: Use green-grey as (less in-your-face) default theme
diff: @import '~@angular/material/theming';
  @include mat-core();
  -$primary: mat-palette($mat-pink, 700, 500, 900);
  -$accent: mat-palette($mat-blue-grey, A200, A100, A400);
  +$primary: mat-palette($mat-teal, 600, 400, 900);
  +$accent: mat-palette($mat-blue-grey, 500, 200, 700);
  $warn: mat-palette($mat-red);
  $theme: mat-dark-theme($primary, $accent, $warn);
  