*[smart-bubbles="true"] .smart-bubble-playing {
  transition-property: none;
  transform: none;
  animation: bubble-animation .5s cubic-bezier(0.25, 0, 0, 1);
  animation-fill-mode: backwards;
}

*[smart-bubbles="true"] .smart-bubble-stopped {
  transition-property: none;
  transform: none;
  animation: none;
}

@keyframes bubble-animation {
  0%   {opacity: 0; transform: translateY(8rem);}
  50%  {opacity: 1;}
  100% {transform: translateY(0);}
}