@keyframes bounce {
  0% {bottom: 0;}
  10% {bottom: -15px;}
  11% {bottom: 0;}
  12% {bottom: -5px;}
  13% {bottom: 0;}
  14% {bottom: -5;}
  15% {bottom: 0;}
  16% {bottom: -5;}
  17% {bottom: 0;}
  100% {bottom: 0;}
}

.bounce{
  animation-name: bounce;
  animation-duration: 5s;
  animation-iteration-count: infinite;
  animation-timing-function: ease-out;
}