将Angular Material 2主题设置为黑暗主题

我最近按照本指南创建了一个Angular Material 2应用程序.现在我想知道如何将主题更改为黑暗或dark-theme？

在style.css文件中添加以下CSS:

@import '~@angular/material/core/theming/all-theme';

// NOTE: Theming is currently experimental and not yet publically released!

@include md-core();

$primary: md-palette($md-deep-purple);
$accent:  md-palette($md-amber, A200, A100, A400);

$theme: md-light-theme($primary, $accent);

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

$dark-primary: md-palette($md-pink, 700, 500, 900);
$dark-accent:  md-palette($md-blue-grey, A200, A100, A400);
$dark-warn:    md-palette($md-deep-orange);

$dark-theme: md-dark-theme($dark-primary, $dark-accent, $dark-warn);

@include angular-material-theme($dark-theme);

PS https://github.com/jelbourn/material2-app/blob/master/src/material2-app-theme.scss