Outline white/grey/blue emojis

app/javascript/flavours/glitch/styles/mastodon-light/variables.scss

@@ -34,3 +34,5 @@ $account-background-color: $white !default;
 @function lighten($color, $amount) {
   @return hsl(hue($color), saturation($color), lightness($color) - $amount);
 }
+
+$emojis-requiring-outlines: 'alien' 'baseball' 'chains' 'chicken' 'cloud' 'crescent_moon' 'dash' 'dove_of_peace' 'eyes' 'first_quarter_moon' 'first_quarter_moon_with_face' 'fish_cake' 'full_moon' 'full_moon_with_face' 'ghost' 'goat' 'grey_exclamation' 'grey_question' 'ice_skate' 'last_quarter_moon' 'last_quarter_moon_with_face' 'lightning' 'loud_sound' 'moon' 'mute' 'page_with_curl' 'rain_cloud' 'ram' 'rice' 'rice_ball' 'rooster' 'sheep' 'skull' 'skull_and_crossbones' 'snow_cloud' 'sound' 'speaker' 'speech_balloon' 'thought_balloon' 'volleyball' 'waning_crescent_moon' 'waning_gibbous_moon' 'waving_white_flag' 'waxing_crescent_moon' 'white_circle' 'white_large_square' 'white_medium_small_square' 'white_medium_square' 'white_small_square' 'wind_blowing_face';