gae/frontend/src/styles/_app-theme.scss

@import '~@angular/material/theming';
@import 'apply-theme';
@import 'blue-theme';

@include mat-core();

$main-theme: $blue-theme;

$primary: mat-palette($main-theme, 600, 100, 900);
$accent:  mat-palette($main-theme, A200, A100, A400);
$app-theme:   mat-light-theme($primary, $accent);

@include angular-material-theme($app-theme);
@include apply-theme($app-theme);