mastodon/app/javascript/flavours/glitch/styles/accessibility.scss

$emojis-requiring-inversion: 'back' 'copyright' 'curly_loop' 'currency_exchange' 'end' 'heavy_check_mark' 'heavy_division_sign' 'heavy_dollar_sign' 'heavy_minus_sign' 'heavy_multiplication_x' 'heavy_plus_sign' 'on' 'registered' 'soon' 'spider' 'telephone_receiver' 'tm' 'top' 'wavy_dash' !default;

%emoji-color-inversion {
  filter: invert(1);
}

.emojione {
  @each $emoji in $emojis-requiring-inversion {
    &[title=':#{$emoji}:'] {
      @extend %emoji-color-inversion;
    }
  }
}

.hicolor-privacy-icons {
  .status__visibility-icon.fa-globe,
  .composer--options--dropdown--content--item .fa-globe {
    color: #1976D2;
  }

  .status__visibility-icon.fa-unlock,
  .composer--options--dropdown--content--item .fa-unlock {
    color: #388E3C;
  }

  .status__visibility-icon.fa-lock,
  .composer--options--dropdown--content--item .fa-lock {
    color: #FFA000;
  }

  .status__visibility-icon.fa-envelope,
  .composer--options--dropdown--content--item .fa-envelope {
    color: #D32F2F;
  }
}