angular material theme with custom theme file

styles.scss

// Custom Theming for Angular Material
// For more information: https://material.angular.io/guide/theming
@import '~@angular/material/theming';
// Plus imports for other components in your app.

// Include the common styles for Angular Material. We include this here so that you only
// have to load a single css file for Angular Material in your app.
// Be sure that you only ever include this mixin once!
@include mat-core();

// import our custom theme
@import './theme.scss';

// import custom componenet themes
@import './custom-component-themes.scss';

// Include theme styles for core and each component used in your app.
// Alternatively, you can import and @include the theme mixins for each component
// that you are using.
@include angular-material-theme($theming-material-components-theme);
@include custom-components-theme($theming-material-components-theme);

/* You can add global styles to this file, and also import other style files */

html, body { height: 100%; }
body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }