@keyframes wave{0%{height:40px;transform:translateY(0)}50%{height:60px;transform:translateY(-20px)}to{height:40px;transform:translateY(0)}}.bar{animation:wave .5s infinite}.bar:first-child{animation:wave .6s infinite;animation-delay:0s}.bar:nth-child(2){animation:wave .3s infinite;animation-delay:.3s}.bar:nth-child(3){animation:wave .4s infinite;animation-delay:.6s}