.custom-emoji {
  width: 4em !important;
  height: 4em !important;
  vertical-align: bottom;
  transition: transform 0.15s ease-in-out;
  position: relative;
}

.emoji, .custom-emoji {
  vertical-align: -0.3em;
}

.emoji:hover, .custom-emoji:hover {
  transform: scale(1.8);
  z-index: 10;
}