node_modules/@angular/material/snack-bar/_snack-bar-theme.scss

@import '../core/typography/typography-utils';
@import '../core/theming/theming';
@import '../core/theming/palette';
@import '../core/style/private';

@mixin mat-snack-bar-color($config-or-theme) {
  $config: mat-get-color-config($config-or-theme);
  $is-dark-theme: map-get($config, is-dark);
  $accent: map-get($config, accent);

  .mat-snack-bar-container {
    // Use the primary text on the dark theme, even though the lighter one uses
    // a secondary, because the contrast on the light primary text is poor.
    color: if($is-dark-theme, $dark-primary-text, $light-secondary-text);
    background: if($is-dark-theme, map-get($mat-grey, 50), #323232);

    @include mat-private-theme-elevation(6, $config);
  }

  .mat-simple-snackbar-action {
    color: if($is-dark-theme, inherit, mat-color($accent, text));
  }
}

@mixin mat-snack-bar-typography($config-or-theme) {
  $config: mat-get-typography-config($config-or-theme);
  .mat-simple-snackbar {
    font: {
      family: mat-font-family($config, body-1);
      size: mat-font-size($config, body-1);
    }
  }

  .mat-simple-snackbar-action {
    line-height: 1;
    font: {
      family: inherit;
      size: inherit;
      weight: mat-font-weight($config, button);
    }
  }
}

@mixin _mat-snack-bar-density($config-or-theme) {}

@mixin mat-snack-bar-theme($theme-or-color-config) {
  $theme: mat-private-legacy-get-theme($theme-or-color-config);
  @include mat-private-check-duplicate-theme-styles($theme, 'mat-snack-bar') {
    $color: mat-get-color-config($theme);
    $density: mat-get-density-config($theme);
    $typography: mat-get-typography-config($theme);

    @if $color != null {
      @include mat-snack-bar-color($color);
    }
    @if $density != null {
      @include _mat-snack-bar-density($density);
    }
    @if $typography != null {
      @include mat-snack-bar-typography($typography);
    }
  }
}