.fv-heart-trail {
  position: fixed;
  pointer-events: none;
  line-height: 1;
  transform: translate(-50%, -50%);
  animation-name: fvHeartFade;
  animation-timing-function: ease-out;
  animation-fill-mode: forwards;
  will-change: opacity, transform;
}
@keyframes fvHeartFade {
  0% { opacity: .75; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -50%) scale(var(--fv-heart-fade-scale, .6)); }
}