Masto/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 {
  :is(.status__visibility-icon, .privacy-dropdown__option) use[href*="planet"] {
    color: #1976d2;
  }

  :is(.status__visibility-icon, .privacy-dropdown__option)
    use[href*="lock-open-simple"] {
    color: #388e3c;
  }

  :is(.status__visibility-icon, .privacy-dropdown__option)
    use[href*="lock-simple"] {
    color: #ffa000;
  }

  :is(.status__visibility-icon, .privacy-dropdown__option) use[href*="#at"] {
    color: #d32f2f;
  }
}