src/app/style/theme/dark.theme.scss
@import '~@angular/material/theming';
// mat-palette($color, default, lighter, darker);
$dark-primary: mat-palette($mat-grey, 700, 900, 100);
$dark-accent: mat-palette($mat-light-blue, 400, 300, 200);
$dark-warn: mat-palette($mat-amber, 500);
$dark-theme: mat-dark-theme($dark-primary, $dark-accent, $dark-warn);