@keyframes nutDropIn {
  0% {
    opacity: 0;
    transform: scaleY(0.8);
  }
  100% {
    opacity: 1;
    transform: scaleY(1);
  }
}

@keyframes nutDropOut {
  0% {
    opacity: 1;
    transform: scaleY(1);
  }
  100% {
    opacity: 0;
    transform: scaleY(0.8);
  }
}

// select、dropdown
@include make-animation(nutDrop);