.what-icon:hover {
  animation: shake 0.5s;
  animation-iteration-count: infinite;
}
.what-icon{
  
   position: fixed;
   bottom: 20px;
   left: 20px;
}
@keyframes shake {
  0% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
  100% {
    transform: translateX(0);
  }
}