node_modules/@angular/material/core/option/_option-theme.scss

@import '../theming/palette';
@import '../theming/theming';
@import '../typography/typography-utils';

@mixin mat-option-color($config-or-theme) {
  $config: mat-get-color-config($config-or-theme);
  $foreground: map-get($config, foreground);
  $background: map-get($config, background);
  $primary: map-get($config, primary);
  $accent: map-get($config, accent);
  $warn: map-get($config, warn);

  .mat-option {
    color: mat-color($foreground, text);

    &:hover:not(.mat-option-disabled),
    &:focus:not(.mat-option-disabled) {
      background: mat-color($background, hover);
    }

    // In multiple mode there is a checkbox to show that the option is selected.
    &.mat-selected:not(.mat-option-multiple):not(.mat-option-disabled) {
      background: mat-color($background, hover);
    }

    &.mat-active {
      background: mat-color($background, hover);
      color: mat-color($foreground, text);
    }

    &.mat-option-disabled {
      color: mat-color($foreground, hint-text);
    }
  }

  .mat-primary .mat-option.mat-selected:not(.mat-option-disabled) {
    color: mat-color($primary, text);
  }

  .mat-accent .mat-option.mat-selected:not(.mat-option-disabled) {
    color: mat-color($accent, text);
  }

  .mat-warn .mat-option.mat-selected:not(.mat-option-disabled) {
    color: mat-color($warn, text);
  }
}

@mixin mat-option-typography($config-or-theme) {
  $config: mat-get-typography-config($config-or-theme);
  .mat-option {
    font: {
      family: mat-font-family($config);
      size: mat-font-size($config, subheading-2);
    }
  }
}

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

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

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