@keyframes grow-shrink {
  0%   {
    height: 80px;
  }
  25%  {
    height: 200px;
  }
  50%  {
    height: 250px;
  }
  66%  {
    height: 200px;
  }
  75%  {
    height: 100px;
  }
  90% {
    height: 300px;
  }
  100% {
    height: 80px;
  }
}