like.css

.y-like {
  display: inline-flex;
  align-items: center;
}

.y-like .heart {
  width: 18px;
  height: 12px;
  position: relative;
}

.y-like .heart::after {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
}

.y-like .heart .fa {
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  font-size: 14px;
  transform: scale(0);
  transition: all .3s cubic-bezier(0.42, 0, 0.34, 1.55);
}

.y-like .heart .fa.active {
  opacity: 1;
  transform: scale(1);
}

.y-like .heart .fa.fa-heart.active {
  color: red;
}

.y-like .count {
  display: inline-flex;
  font-size: 14px;
  height: 24px;
}

.y-like .num {
  width: 8px;
  height: 24px;
  line-height: 24px;
  text-align: center;
  transition: all .3s;
  position: relative;
}

.y-like .num span {
  width: 100%;
  height: 100%;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
}

.y-like .num span.upup {
  animation: upup .5s
}

.y-like .num span.upupin {
  opacity: 0;
  animation: upupin .5s
}

.y-like .num span.down {
  animation: down .5s
}

.y-like .num span.downin {
  opacity: 0;
  animation: downin .5s
}

@keyframes down {
  0% {
    opacity: 0;
    transform: translateY(-100%);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes downin {
  0% {
    opacity: 1;
    transform: translateY(0);
  }

  100% {
    opacity: 0;
    transform: translateY(100%);
  }
}

@keyframes upup {
  0% {
    opacity: 0;
    transform: translateY(100%);
  }

  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes upupin {
  0% {
    opacity: 1;
    transform: translateY(0);
  }

  100% {
    opacity: 0;
    transform: translateY(-100%);
  }
}